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NO.10 LOW IDLE/STALLS DURING DECELERATION [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010300000W07

10 | Low idle/stalls during deceleration
DESCRIPTION | • Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
POSSIBLE CAUSE | • Vacuum leakage • IAC valve malfunction • Air leakage from intake-air system • TP sensor or related circuit malfunction • MAF sensor or related circuit malfunction
• Brake switch or related circuit malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Does engine idle rough? | Yes | Go to symptom troubleshooting "No.8 Engine runs rough/rolling idle".
No | Go to next step.
2 | • Verify following:

  - Proper routing and no damage of vacuum lines
  - IAC valve properly connected
  - No air leakage from intake-air system

• Are all items normal?
Yes
Go to next step.
No | Service as necessary. Repeat Step 2.
3 | • Connect WDS or equivalent to DLC-2. • Turn ignition switch to ON (Engine OFF). • Retrieve any DTC. • Is "PASSED" displayed? | Yes | No DTC is displayed: • Go to next step.
No | DTC is displayed: • Go to appropriate DTC test.
4 | • Does idle speed drop or stall when disconnecting IAC valve? | Yes | Go to next step.
No | Inspect following: • Circuit from IAC valve to PCM connector terminal 87 or 88 for open and short • IAC valve for sticking

  - If normal, go to next step.

5 | • Disconnect vacuum hose between purge solenoid valve and intake manifold from purge solenoid valve side. • Plug opening end of vacuum hose. • Drive vehicle. • Does engine condition improve? | Yes | Inspect EVAP control system.
No | Go to next step.
6 | • Connect WDS or equivalent to DLC-2. • Access TP, MAF and VSS PIDs. • Monitor each PID while driving vehicle. (See PCM Inspection Using the SST (WDS or equivalent).) • Are PIDs normal? | Yes | Intermittent concern exists. (See INTERMITTENT CONCERN TROUBLESHOOTING [AJ].)
No | TP PID: • Inspect TP sensor. MAF PID: • Inspect MAF sensor. VSS PID: • Inspect VSS.
7 | • Verify test results.

  - If normal, return to diagnostic index to service any additional symptoms.
  - If malfunction remains, inspect related Service Information and perform repair or diagnosis.

  • If vehicle is repaired, troubleshooting completed.
  • If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram PCM.