Low Idle / Stalls During Deceleration

PINPOINT TEST 6 LOW IDLE / STALLS DURING DECELERATION DESCRIPTION

PINPOINT TEST 6	LOW IDLE / STALLS DURING DECELERATION
DESCRIPTION	Engine stops unexpectedly at beginning of deceleration or recovery from deceleration

PINPOINT TEST 6 LOW IDLE / STALLS DURING DECELERATION INSPECTION & ACTION

PINPOINT TEST 6		LOW IDLE / STALLS DURING DECELERATION
STEP	INSPECTION		ACTION
1	PRELIMINARY CHECKS Perform the following preliminary checks: Vacuum lines (routing, leaks) Idle air control (connections) Intake air tubes Wiring connections Are all checks OK?	Yes	Go to next step.
1		No	Service as required. Verify symptom no longer exists.
2	DOES THE ENGINE IDLE ROUGH? Does the engine idle rough?	Yes	See ENGINE POOR DRIVEABILITY .
2	DOES THE ENGINE IDLE ROUGH? Does the engine idle rough?	No	Go to next step.
3	IDLE AIR CONTROL (IAC) CHECK Start engine and let idle. Note RPM. While checking for rpm drop or engine stall, disconnect IAC valve. Does RPM drop or engine stall?	Yes	Go to next step.
3		No	For A/T vehicles: Go to next step. For M/T vehicles: Go to step 5.
4	CHECK TRANSMISSION (FOR A/T WITH STALLS/QUITS ON DECELERATION) Check the transmission. See AUTOMATIC TRANSMISSION PINPOINT TEST 32: TORQUE CONVERTER OPERATION CONCERNS: CLUTCH ALWAYS APPLIES / STALLS VEHICLE for automatic transmission concerns. Is transmission OK?	Yes	Go to next step.
4		No	Service as required.
5	FOR LOW IDLE WITH A/C ON, CHECK ACCS PID NOTE: This test step will determine if the PCM is receiving the ACCS signal. Connect WDS or equivalent tester. Start engine. Turn A/C on (verify A/C clutch engages). Monitor ACCS PID. Key OFF, A/C off. Is ACCS PID ON with the A/C clutch engaged?	Yes	ACCS input is OK. Go to next step.
5		No	ACCS input fault. Go to step 7. See A/C CLUTCH RELAY (ACCR) MALFUNCTION .
6	CHECK FUEL DELIVERY SYSTEM Perform fuel pressure inspection. See PINPOINT TEST 10: FUEL LINE PRESSURE/FUEL PRESSURE HOLD INSPECTION . Fuel line pressure: 207-448 kPa (30-71 psi) for 3.0L/4.0L 240-380 kPa (35-55 psi) for 2.3L Is fuel pressure correct?	Yes	Go to next step.
6		No	If pressure is greater than 448 kPa (71 psi) for 3.0L/4.0L or 380 kPa (55 psi) for 2.3L: Replace fuel pump module. See FUEL PUMP REMOVAL / INSTALLATION . If pressure is less than 207 kPa (30 psi) for 3.0L/4.0L or 240 kPa (35 psi) for 2.3L: Check fuel supply line for restriction.
7	CHECK FUEL DELIVERY SYSTEM Check fuel pump fuel flow. See GENERAL PINPOINT TEST 5: FUEL DELIVERY SYSTEM . Does fuel system flow the required amount of fuel?	Yes	Check injector for leakage. See GENERAL PINPOINT TEST 11: FUEL INJECTOR INSPECTION . If injector leaks, replace injector. See FUEL INJECTION SUPPLY MANIFOLD AND FUEL INJECTOR - 2.3L REMOVAL / INSTALLATION or see FUEL INJECTION SUPPLY MANIFOLD AND FUEL INJECTOR - 3.0L REMOVAL / INSTALLATION or see FUEL INJECTION SUPPLY MANIFOLD AND FUEL INJECTOR - 4.0L REMOVAL / INSTALLATION . If injector OK, Go to next step.
7		No	Check fuel supply line for restriction.
8	ADDITIONAL CHECKS Additional checks: Base engine Ignition (timing, secondary) See SYMPTOM TROUBLESHOOTING CHART - ENGINE DRIVEABILITY for other possible causes of a stalling symptom Are all checks OK?	Yes	Go to next step.
8		No	Service as required. Verify symptom no longer exists.
9	VERIFY TEST RESULTS Are test results OK?	Yes	Troubleshooting complete.
9	VERIFY TEST RESULTS Are test results OK?	No	Service any additional symptoms. See SYMPTOM TROUBLESHOOTING CHART - ENGINE DRIVEABILITY .