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Quick Diagnostic Chart

Troubleshooting item Possible factor Starter motor malfunction (mechanical or electrical) Starter circuit including ignition switch is open Improper engine oil level Low or dead battery Charging system malfunction Improper engine compression Improper oil level gauge Base engine malfunction Drive plate is seized Improper tension or damaged drive belts Improper engine coolant level Water and anti freeze mixture is improper Cooling system malfunction (such as radiator, hoses, overflow system, thermostat) Cooling fan system malfunction
1 Blown fuses                            
2 Check engine light illuminates                            
3 Will not crank x     x       x x          
4 Hard to star/long crank/erratic start/erratic crank x         x                
5 Engine stalls Alter start/at idle           x                
6 Cranks normally but will not start           x                
7 Engine oil warning light illuminated/message related to engine hydraulic pressure malfunction indicated hydraulic in display     x         x            
8 Engine runs rough/rolling idle           x                
9 Fast idle runs on                         x  
10 Low idle/stalls during deceleration         x x                
11 Engine stalls/quits Acceleration/cruise           x                
Engine runs rough Acceleration/cruise           x                
Misses Acceleration/cruise           x                
Buck/jerk Acceleration/cruise/deceleration           x                
Hesitation/stumble Acceleration           x                
Surges Acceleration/cruise           x                
12 Lack/loss of power Acceleration/cruise           x                
13 Knocking/pinging Acceleration/cruise                         x  
14 Poor fuel economy           x         x   x x
15 Emission compliance           x         x   x  
16 High oil consumption/leakage             x x            
17 Cooling system concerns Overheating         x         x x x x x
18 Cooling system concerns Runs cold                         x x
19 Exhaust smoke           x             x  
20 Fuel odor (in engine compartment)                            
21 Engine noise         x     x   x        
22 Vibration concerns (engine)                            
23 A/C does not work sufficiently                            
24 A/C is always on or A/C compressor runs continuously                            
25 Sulfuric smell occurs                            
26 Fuel refill concerns                            
27 Fuel filling shut off concerns                            
28 Spark plug condition           x                
Troubleshooting item Possible factor Engine or transaxle mounts are improperly installed Cooling fan or condenser fan seats improper Fuel quality Improper engine oil viscosity Improper valve timing Oil leakage Improper oil or fluid level Coolant leakage Electric variable valve timing system malfunction Hydraulic variable valve timing system malfunction Engine overheating Air cleaner element clogged or restricted Air leakage from intake-air system (loose tubes, cracks, gaskets breakage) Air section in intake-air system Intake-air system malfunction
1 Blown fuses                              
2 Check engine light illuminates                              
3 Will not crank                              
4 Hard to star/long crank/erratic start/erratic crank     x x x           x   x x x
5 Engine stalls Alter start/at idle     x   x       x x x   x x x
6 Cranks normally but will not start     x   x       x   x   x x x
7 Engine oil warning light illuminated/message related to engine hydraulic pressure malfunction indicated hydraulic in display           x x                
8 Engine runs rough/rolling idle     x x x       x x x   x x x
9 Fast idle runs on                           x  
10 Low idle/stalls during deceleration     x   x                 x x
11 Engine stalls/quits Acceleration/cruise     x   x           x x x x x
Engine runs rough Acceleration/cruise     x   x           x x x x x
Misses Acceleration/cruise     x   x           x x x x x
Buck/jerk Acceleration/cruise x   x   x           x x x x x
Hesitation/stumble Acceleration/cruise x   x   x           x x x x x
Surges Acceleration/cruise x   x   x           x x x x x
12 Lack/loss of power Acceleration/cruise     x   x           x x x   x
13 Knocking/pinging Acceleration/cruise     x                   x   x
14 Poor fuel economy     x                   x x x
15 Emission compliance                     x     x x
16 High oil consumption/leakage       x   x                  
17 Cooling system concerns Overheating               x              
18 Cooling system concerns Runs cold   x                          
19 Exhaust smoke         x x   x       x x x x
20 Fuel odor (in engine compartment)                              
21 Engine noise                 x       x x  
22 Vibration concerns (engine) x x                          
23 A/C does not work sufficiently                              
24 A/C is always on or A/C compressor runs continuously                              
25 Sulfuric smell occurs     x                        
26 Fuel refill concerns                              
27 Fuel filling shut off concerns                              
28 Spark plug condition                             x
Troubleshooting item Possible factor Drive-by-wire control system improper operation Drive-by-wire control system operates with brake override system Throttle body malfunction Purge solenoid valve malfunction Vacuum leakage (vacuum hose damage, misrouting) Ignition coil malfunction (e.g. open, short or cracks) Initial ignition timing misadjustment (CKP and pulse wheel misadjustment) Spark plug malfunction Fuel pump (low-pressure side) malfunction (mechanically or electrically) Pressure regulator (built into fuel pump unit at fuel tank) matf unction Inadequate fuel pressure (high-pressure side) Inadequate fuel pressure (low-pressure side) Fuel line restricted or clogged
1 Blown fuses                          
2 Check engine light illuminates                          
3 Will not crank                          
4 Hard to star/long crank/erratic start/erratic crank x     x x x   x x   x x x
5 Engine stalls Alter start/at idle x     x x x     x   x x x
6 Cranks normally but will not start x     x x x     x   x x x
7 Engine oil warning light illuminated/message related to engine hydraulic pressure malfunction indicated hydraulic in display                          
8 Engine runs rough/rolling idle x     x x x   x x   x x x
9 Fast idle runs on x   x   x                
10 Low idle/stalls during deceleration x     x x       x   x x x
11 Engine stalls/quits Acceleration/cruise x x x x x     x x   x x x
Engine runs rough Acceleration/cruise x x x x x     x x   x x x
Misses Acceleration/cruise x x x x x     x x   x x x
Buck/jerk Acceleration/cruise/deceleration x x x x x     x x   x x x
Hesitation/stumble Acceleration x x x x x     x x   x x x
Surges Acceleration/cruise x x x x x     x x   x x x
12 Lack/loss of power Acceleration/cruise x x x x x x   x x   x x x
13 Knocking/pinging Acceleration/cruise               x          
14 Poor fuel economy         x     x x   x x x
15 Emission compliance       x x x   x x   x x x
16 High oil consumption/leakage                          
17 Cooling system concerns Overheating                          
18 Cooling system concerns Runs cold                          
19 Exhaust smoke           x   x x   x x x
20 Fuel odor (in engine compartment)       x x                
21 Engine noise x     x x                
22 Vibration concerns (engine)                          
23 A/C does not work sufficiently                          
24 A/C is always on or A/C compressor runs continuously                          
25 Sulfuric smell occurs                          
26 Fuel refill concerns                          
27 Fuel filling shut off concerns                          
28 Spark plug condition               x          
Troubleshooting item Possible factor Fuel Injector malfunction (inoperative) Fuel filler cap malfunction Fuel liters restricted or clogged Relief valve malfunction (built-into high pressure fuel pump) Spill valve control solenoid valve malfunction (built-into high pressure fuel pump) Fuel leakage at fuel line High pressure fuel pump malfunction Incorrect fuel injection timing or amount Improper air/fuel ratio mixture control Exhaust system or catalytic converter restriction Exhaust gas leakage Catalytic converter malfunction PCV valve malfunction Fuel tank system vent malfunction Charcol canister malfunction
1 Blown fuses                              
2 Check engine light illuminates                              
3 Will not crank                              
4 Hard to star/long crank/erratic start/erratic crank x   x x x x x x x x     x    
5 Engine stalls Alter start/at idle x   x x x x x x x x     x    
6 Cranks normally but will not start x   x x x x x x y. x     x    
7 Engine oil warning light illuminated/message related to engine hydraulic pressure malfunction indicated hydraulic in display                              
8 Engine runs rough/rolling idle x   x x x x x x   x     x    
9 Fast idle runs on x       x                    
10 Low idle/stalls during deceleration x   x   x x x x              
11 Engine stalls/quits Acceleration/cruise x     x x x x x x x x   x    
Engine runs rough Acceleration/cruise x     x x x x x x x x   x    
Misses Acceleration/cruise x     x x x x     x x   x    
Buck/jerk Acceleration/cruise/deceleration x     x x x x x x x x   x    
Hesitation/stumble Acceleration x     x x x x x x x x   x    
Surges Acceleration/cruise x     x x x x x x x x   x    
12 Lack/loss of power Acceleration/cruise x     x x x x x   x     x    
13 Knocking/pinging Acceleration/cruise                              
14 Poor fuel economy x     x x x x x   x     x    
15 Emission compliance       x x x x x x x x x x    
16 High oil consumption/leakage                         x    
17 Cooling system concerns Overheating                              
18 Cooling system concerns Runs cold                              
19 Exhaust smoke       x x   x x     x   y.    
20 Fuel odor (in engine comportment)   x       x                  
21 Engine noise x           x                
22 Vibration concerns (engine)                              
23 A/C does not work sufficiently                              
24 A/C is always on or A/C compressor runs continuously                              
25 Sulfuric smell occurs                              
26 Fuel refill concerns                              
27 Fuel filling shut off concerns                              
28 Spark plug condition               x   x          
Troubleshooting item Possible factor Conslant voltage supply circuit malfunction Main relay malfunction (mechanically or electrically) No battery power supply to PCM Poor PCM ground or vehicle ground (open) Electrical connector disconnection Oil pressure switch or related circuit malfunction ECT sensor or related circuit malfunction Transaxle range sensor malfunction Brake switch or related circuit malfunction A/F sensor or H02S or related circuit malfunction IAT sensor No 1 (integrated in MAF sensor/IAT sensor No. 1) or related circuit malfunction IAT sensor No. 2 (integrated in MAP sensor/IAT sensor No, 2) or related circuit malfunction Fuel pressure sensor or related circuit malfunction MAP sensor or related circuit malfunction
1 Blown fuses                            
2 Check engine light illuminates         x                  
3 Will not crank   x x x       x            
4 Hard to star/long crank/erratic start/erratic crank       x x   x     x     x x
5 Engine stalls Alter start/at idle     x x x   x     x     x x
6 Cranks normally but will not start     x x x   x     x     x  
7 Engine oil warning light illuminated/message related to engine hydraulic pressure malfunction indicated hydraulic in display           x                
8 Engine runs rough/rolling idle         x   x     x     x  
9 Fast idle runs on             x     x        
10 Low idle/stalls during deceleration             x   x x     x x
11 Engine stalls/quits Acceleration/cruise   x         x     x x   x x
Engine runs rough Acceleration/cruise   x         x     x x   x x
Misses Acceleration/cruise   x         x     x x   x x
Buck/jerk Acceleration/cruise/deceleration             x     x x   x x
Hesitation/stumble Acceleration/cruiseeration             x     x x   x x
Surges Acceleration/cruiseeration.icruise   x         x     x x   x x
12 Lack/loss of power Acceleration/cruise             x     x x   x x
13 Knocking/pinging Acceleration/cruise             x         x    
14 Poor fuel economy             x       x   x x
15 Emission compliance                         x  
16 High oil consumption/leakage                            
17 Cooling system concerns Overheating         x   x              
18 Cooling system concerns Runs cold             x              
19 Exhaust smoke             x     x x   x x
20 Fuel odor (in engine comportment)                            
21 Engine noise                            
22 Vibration concerns (engine)                            
23 A/C does not work sufficiently                            
24 A/C is always on or A/C compressor runs continuously                            
25 Sulfuric smell occurs                            
26 Fuel refill concerns                            
27 Fuel filling shut off concerns                            
28 Spark plug condition             x     x        
Troubleshooting item Possible factor Intake CMP sensor damaged (e.g. open or short circuit) Intake CMP sensor pulse wheel (intake camshaft) damaged Exhaust CMP sensor damaged (e.g. open or short circuit) Exhaust CMP sensor pulse wheel (exhaust camshaft) damaged Improper gap between CKP sensor and pulse wheel CKP sensor damaged (e.g. open or short circuit) CKP sensor pulse wheel damaged MAF sensor or related circuit malfunction KS or related circuit malfunction TP sensor or related circuit malfunction APP sensor or related circuit malfunction Improper vehicle speed signal Cruise control system operation improperly Check valve malfunction
1 Blown fuses                            
2 Check engine light illuminates                            
3 Will not crank                            
4 Hard to star/long crank/erratic start/erratic crank x x x x   x x x            
5 Engine stalls Alter start/at idle x x x x   x x x     x      
6 Cranks normally but will not start     x x   x x x     x      
7 Engine oil warning light illuminated/message related to engine hydraulic pressure malfunction indicated hydraulic in display                            
8 Engine runs rough/rolling idle x x x x   x x x     x      
9 Fast idle runs on                     x   x  
10 Low idle/stalls during deceleration x x x x   x x x   x x      
11 Engine stalls/quits Acceleration/cruise x x x x   x   x   x x      
Engine runs rough Acceleration/cruise x x x x   x x x   x x      
Misses Acceleration/cruise x x x x   x x x   x x      
Buck/jerk Acceleration/cruise/deceleration x x x x   x x x   x x      
Hesitation/stumble Acceleration x x x x   x x x   x x      
Surges Acceleration/cruise x x x x   x x x   x x      
12 Lack/loss of power Acceleration/cruise x x x x   x x x     x      
13 Knocking/pinging Acceleration/cruise               x x          
14 Poor fuel economy x x x x   x x x   x x      
15 Emission compliance                            
16 High oil consumption/leakage                            
17 Cooling system concerns Overheating                            
18 Cooling system concerns Runs cold                            
19 Exhaust smoke               x   x x      
20 Fuel odor (in engine comportment)                           x
21 Engine noise                            
22 Vibration concerns (engine)                            
23 A/C does not work sufficiently                            
24 A/C is always on or A/C compressor runs continuously                            
25 Sulfuric smell occurs                            
26 Fuel refill concerns                            
27 Fuel filling shut off concerns                            
28 Spark plug condition               x            
Troubleshooting item Possible factor A/C system improper operation Improper refrigerant charging amount A/C relay (A/C control signal circuit) malfunction A/C compressor magnetic clutch malfunction ATX related parts malfunction Improper ATF level Brake dragging Loose parts Improper balance ol wheels and tires Drive line malfunction Suspension malfunction Immobilizer system operating properly Immobilizer system or related circuit malfunction Advanced keyless entry system malfunction
1 Blown fuses                            
2 Check engine light illuminates                            
3 Will not crank                         x  
4 Hard to star/long crank/erratic start/erratic crank                            
5 Engine stalls Alter start/at idle x   x                      
6 Cranks normally but will not start                            
7 Engine oil warning light illuminated/message related to engine hydraulic pressure malfunction indicated hydraulic in display                            
8 Engine runs rough/rolling idle x   x                      
9 Fast idle runs on x   x   x                  
10 Low idle/stalls during deceleration       x x                  
11 Engine stalls/quits Acceleration/cruise x             x            
Engine runs rough Acceleration/cruise x       x     x            
Misses Acceleration/cruise x       x     x            
Buck/jerk Acceleration/cruise/deceleration x       x     x            
Hesitation/stumble Acceleration x       x     x            
SURGES Acceleration/cruise x       x     x            
12 Lack/loss of power Acceleration/cruise x   x   x   x              
13 Knocking/pinging Acceleration/cruise                            
14 Poor fuel economy x         x x   x          
15 Emission compliance                            
16 High oil consumption/leakage                            
17 Cooling system concerns Overheating x x                        
18 Cooling system concerns Runs cold                            
19 Exhaust smoke                            
20 Fuel odor (in engine comportment)                            
21 Engine noise x     x                    
22 Vibration concerns (engine)               x x x x      
23 A/C does not work sufficiently x x   x                    
24 A/C is always on or A/C compressor runs continuously x   x x                    
25 Sulfuric smell occurs                            
26 Fuel refill concerns                            
27 Fuel filling shut off concerns                            
28 Spark plug condition                            
Troubleshooting item Possible factor Instrument cluster malfunction Driver-side buckle switch malfunction Door latch switch or liftgate latch switch malfunction Hood latch switch malfunction Battery malfunction (deterioration) Ambient temperature sensor malfunction ABS wtieel-speed sensor malfunction Steering angle sensor malfunction Driver-side air mix actuator malfunction Climate control unit malfunction Keyless antenna malfunction Boost air temperature sensor or related circuit malfunction Boost pressure sensor or related circuit malfunction Three way solenoid valve malfunction EGR valve malfunction Turbocharger malfunction Ejector malfunction Fuel pump control module malfunction
1 Blown fuses                                    
2 Check engine light illuminates x                                  
3 Will not crank x       x                          
4 Hard to star/long crank/erratic start/erratic crank                                    
5 Engine stalls Alter start/at idle                                    
6 Cranks normally but will not startill not start                                    
7 Engine oil warning light illuminated/message related to engine hydraulic pressure malfunction indicated hydraulic in display x                                  
8 Engine runs rough/rolling idle                                    
9 Fast idle runs on                                    
10 Low idle/stalls during deceleration                                    
11 Engine stalls/quits Acceleration/cruise                                    
Engine runs rough Acceleration/cruise                                    
Misses Acceleration/cruise                                    
Buck/jerk Acceleration/cruise/deceleration                                    
Hesitation/stumble Acceleration                                    
Surges Acceleration/cruise                                    
12 Lack/loss of power Acceleration/cruise                       x     x x   x
13 Knocking/pinging Acceleration/cruise                         x          
14 Poor fuel economy                                    
15 Emission compliance                                 x x
16 High oil consumption/leakage                                    
17 Cooling system concerns Overheating x                                  
18 Cooling system concerns Runs cold x                                  
19 Exhaust smoke                       x x          
20 Fuel odor (in engine comportment)                                 x  
21 Engine noise                                    
22 Vibration concerns (engine)                                    
23 A/C does not work sufficiently x                 x                
24 A/C is always on or A/C compressor runs continuously                   x                
25 Sulfuric smell occurs                                    
26 Fuel refill concerns                                    
27 Fuel filling shut off concerns                                    
28 Spark plug condition                                    
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