Lack/Loss Of Power

LACK/LOSS OF POWER REFERENCE CHART

9	LACK/LOSS OF POWER
DESCRIPTION	Performance poor under load (i.e., power down when climbing hills)

DTC DETECTION CONDITION POSSIBLE COUSES CHART

STEP	INSPECTION		ACTION
1	PRELIMINARY CHECKS NOTE: Verify symptom is reported under normal driving conditions without excessive engine/vehicle load conditions. Carry out the following preliminary checks: Vacuum lines (check for damage and correct routing). Intake air system (check for damaged tubes and dirty air filter). Vehicle wiring (disconnected, corroded/damaged). Radiator (obstructed). Transaxle (fluid check). Be aware of the over RPM/speed limiting functions of the PCM. Are all checks OK?	Yes	GO to the next step.
1		No	REPAIR as required. VERIFY symptom no longer exists.
2	CARRY OUT PCM QUICK TEST See PCM QUICK TEST . Are any DTCs displayed during Continuous Memory, Key ON, Engine OFF (KOEO), Engine OFF (KOEO) or Key On, Engine Running (KOER) Self-Tests?	Yes	CHECK for cause. See DTC INDEX - PCM .
2		No	GO to the next step.
3	CHECK PIDs Connect IDS or equivalent tester. Check following PIDs. DPFE, ECT, LONGFT1, LONGFT2, VPWR. See PCM PROGRAMMING - IDS . Are PIDs within specification?	Yes	GO to the next step.
3		No	REPAIR as required.
4	CHECK FUEL DELIVERY SYSTEM Carry out fuel pressure inspection. See TEST 8: FUEL LINE/FUEL PRESSURE HOLD INSPECTION . Fuel line pressure: 240-380 kPa (35-55 psi) Is fuel pressure correct?	Yes	GO to the next step.
4		No	If pressure is greater than 380 kPa (55 psi): INSTALL a new fuel pump. See FUEL PUMP MODULE REMOVAL/INSTALLATION . If pressure is less than 240 kPa (35 psi): CHECK fuel supply line for restriction.
5	CHECK FUEL DELIVERY SYSTEM Check fuel pump fuel flow. See TEST 4: FUEL DELIVERY SYSTEM . Did fuel system flow the required amount of fuel?	Yes	CHECK injector for leakage. See TEST 9: FUEL INJECTOR INSPECTION . If injector leaks, REPAIR as necessary. See FUEL RAIL REMOVAL/INSTALLATION - 2.5L or FUEL RAIL REMOVAL/INSTALLATION - 3.0L 01-14A-29. If injector OK, GO to the next step.
5		No	CHECK fuel supply line for restriction.
6	CHECK SECONDARY IGNITION SYSTEM Is a strong blue spark visible at each disconnected high-tension lead while cranking engine?	Yes	CHECK the spark plugs. If OK, GO to the next step. If not OK, CLEAN or INSTALL new spark plugs. See SPARK PLUGS REMOVAL/INSTALLATION - 2.5L or SPARK PLUGS REMOVAL/INSTALLATION - 3.0L .
6		No	CHECK following: High-tension leads. CKP sensor. See CRANKSHAFT POSITION (CKP) SENSOR MALFUNCTION . CMP sensor. See CAMSHAFT POSITION (CMP) SENSOR MALFUNCTION .
7	CHECK MASS AIR FLOW (MAF) /INTAKE AIR TEMPERATURE (IAT) SENSOR See MASS AIR FLOW (MAF) SENSOR . Is a fault indicated?	Yes	REPAIR as required.
7		No	GO to the next step.
8	CHECK EXHAUST SYSTEM Is there a restriction in the exhaust system?	Yes	REPAIR as required.
8		No	GO to the next step.
9	CHECK BASE ENGINE Check for base engine concerns (such as improper compression, worn camshaft/valve train, gasket leaks). See ENGINE . Is a fault indicated?	Yes	REPAIR as required.
9		No	GO to the next step.
10	CHECK AUTOMATIC TRANSAXLE (A/T) If vehicle has manual transaxle, go to the next step. If vehicle has automatic transaxle, see SYMPTOM TROUBLESHOOTING CHART - EXTERNAL CONTROLS for Diagnostic Strategy. Is automatic transaxle OK?	Yes	GO to the next step.
10		No	REPAIR as required.
11	CHECK FOR BRAKE SYSTEM CONCERNS see SYMPTOM TROUBLESHOOTING CHART - CONVENTIONAL BRAKE SYSTEM for diagnostic strategy. Is a fault indicated?	Yes	REPAIR as required.
11		No	GO to the next step.
12	ADDITIONAL CHECKS Additional checks: Customer driving habits (such as excessive loads or over RPM/speed limiting functions enabled). Ignition base timing (if not previously checked). Clutch (M/T). Charging system. Are all checks OK?	Yes	VERIFY test results. If OK, See DIAGNOSTIC INDEX to REPAIR any additional symptoms.
12		No	REPAIR as required. VERIFY symptom no longer exists.