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NO.10 LOW IDLE/STALLS DURING DECELERATION [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME010300103215

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 the engine idle rough? | Yes | Go to symptom troubleshooting "No.8 Engine runs rough/rolling idle". (See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
No | Go to the next step.
2 | • Verify the 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 the next step.
No | Service if necessary. Repeat Step 2.
3 | • Connect the WDS or equivalent to the DLC-2. • Turn the ignition switch to the ON position (Engine off). • Retrieve any DTC. • Is "PASSED" displayed? | Yes | No DTC is displayed: • Go to the next step.
No | DTC is displayed: • Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
4 | • Does the idle speed drop or stall when the IAC valve is disconnected? | Yes | Go to the next step.
No | Inspect the following: • Circuit from IAC valve to PCM connector terminal 54 or 83 for open and short • IAC valve for sticking

  - If normal, go to the next step.

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