Lack / Loss Of Power

LACK / LOSS OF POWER DESCRIPTION

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

LACK / LOSS OF POWER INSPECTION/ACTION CHART

STEP	INSPECTION		ACTION
1	PRELIMINARY CHECKS NOTE: Verify symptom is reported under normal driving conditions without excessive engine/vehicle load conditions. Perform the following preliminary checks: Vacuum lines (check for damage and proper routing). Intake air system (check for damaged tubes and dirty air filter). Vehicle wiring (disconnected, corroded/damaged). Throttle linkage. Radiator (obstructed). Transaxle (fluid check). Be aware of the over rpm/speed limiting functions of the PCM. Are all checks OK?	Yes	Go to next step.
1		No	Service as required. Verify symptom no longer exists.
2	PERFORM 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 DIAGNOSTIC TROUBLE CODE NUMBERS .
2		No	Go to next step.
3	CHECK PIDS Connect WDS or equivalent tester. Check following PIDS. DPFE, ECT, IAC, LONGFT1, LONGFT2, VPWR. See POWERTRAIN CONTROL MODULE (PCM) INSPECTION . Are PIDS within specification?	Yes	Go to next step.
3		No	Service as required.
4	CHECK FUEL DELIVERY SYSTEM Perform fuel pressure inspection. See TEST 9: FUEL LINE/FUEL PRESSURE HOLD INSPECTION . Fuel line pressure: 240-380 kPa (35-55 psi) Is fuel pressure correct?	Yes	Go to next step.
4		No	If pressure is greater than 380 kPa (55 psi): Replace fuel pump. See FUEL PUMP MODULE . 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 10: FUEL INJECTOR INSPECTION . If injector leaks, service as necessary. See FUEL INJECTORS . If injector OK, Go to next step.
5		No	Check fuel supply line for restriction.
6	CHECK SECONDARY IGNITION SYSTEM Is strong blue spark visible at each disconnected high-tension lead while cranking engine?	Yes	Check spark plugs: If OK, Go to next step. If not OK, clean or replace spark plugs. See IGNITION COIL-ON-PLUG AND SPARK PLUG -- 2.3L , or IGNITION COIL-ON-PLUG AND SPARK PLUG -- 3.0L .
6		No	Check following: High-tension leads. CKP sensor. See CRANKSHAFT POSITION (CKP) SENSOR MALFUNCTION . CMP sensor. See CAMSHAFT POSITION SENSOR (CMP) MALFUNCTION .
7	CHECK MASS AIR FLOW (MAF) / INTAKE AIR TEMPERATURE (IAT) SENSOR See MASS AIR FLOW (MAF) SENSOR . Is a fault indicated?	Yes	Service as required.
7		No	Go to next step.
8	CHECK EXHAUST SYSTEM Is there a restriction in the exhaust system?	Yes	Service as required.
8		No	Go to 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	Service as required.
9		No	Go to next step.
10	CHECK AUTOMATIC TRANSAXLE (A/T) If vehicle has manual transaxle, Go to next step. If vehicle has automatic transaxle, Go to TROUBLESHOOTING for Diagnostic Strategy. Is automatic transaxle OK?	Yes	Go to next step.
10		No	Service as required.
11	CHECK FOR BRAKE SYSTEM CONCERNS GO to TROUBLESHOOTING for Diagnostic Strategy. Is a fault indicated?	Yes	Service as required.
11		No	Go to 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	Go to next step.
12		No	Service as required. Verify symptom no longer exists.
13	Verify test results. If OK, see DIAGNOSTIC INDEX to service any additional symptoms.