Low Idle/Stalls During Deceleration

LOW IDLE/STALLS DURING DECELERATION DESCRIPTION

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

LOW IDLE/STALLS DURING DECELERATION INSPECTION/ACTION CHART

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 DRIVABILITY .
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. Did rpm drop or engine stall?	Yes	Go to next step.
3		No	See DRIVE CYCLE . If no DTCs displayed: For A/T vehicles: Go to next step. For MAT vehicles: Go to step 5.
4	CHECK TRANSAXLE (FOR A/T WITH STALLS/QUITS ON DECELERATION) See TORQUE CONVERTER OPERATION CONCERNS: ALWAYS APPLIED/MAY STALL ENGINE for automatic transaxle concerns. Is transaxle 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. (The PCM does not have the ability to turn the A/C off. The ACCS signal informs the PCM of additional A/C load.) 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 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.
6		No	If pressure is greater than 380 kPa (55 PSI): Replace fuel pump module. See FUEL PUMP MODULE . If pressure is less than 240 kPa (35 psi): Check fuel supply line for restriction.
7	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. TEST 10: FUEL INJECTOR INSPECTION . If injector leaks: See FUEL INJECTORS . 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 DIAGNOSTIC INDEX 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. If OK, DIAGNOSTIC INDEX to service any additional symptoms.