Rough Idle/Engine Stalls Just After Starting
F2-40flowchart12 ROUGH IDLE/ENGINE STALLS JUST AFTER STARTING
Engine starts normally, but vibrates excessively or stalls just after starting (acceleration from idle). Idle conditions are normal in the other conditions.
NOTE
[TROUBLESHOOTING HINTS] (1) Fuel injection control system: Start signal not input to ECM. (2) Ignition timing misadjustment.
Rough Idle/Engine Stalls Just After Starting
1
STEP 1: Is "00" displayed on SST with ignition switch ON? (Self-Diagnosis Checker, System Selector 49 B019 9A0, SELECT SW: A, 49 H018 9A1, Monitor Light) (page F2-73)
No
Diagnostic trouble code No. displayed: Check for cause (Refer to specified check sequence) (page F2-74)
Yes ("00" displayed): Go to next step
2
STEP 2: Are ECM terminal voltages OK (especially 2B)? (page F2-141)
No
Check for cause (page F2-141)
Yes: Go to next step
3
STEP 3: Connect System Selector to data link connector and set Test Switch to "SELF TEST"; is ignition timing at idle correct after warm-up? (page F2-70) Ignition timing (BTDC): 9—11° {10 ± 1°}
No
Adjust ignition timing (page F2-70)
Yes
4
In same condition as step 3 inspection and apply parking brake. Is idle speed correct? (page F2-71) Idle speed: 640—700 {670 ± 30} rpm. If OK, go to next step. If not OK, adjust idle speed (page F2-71)
If OK
5
STEP 4: Check for continuity between throttle position sensor terminals C and D (page F2-150)
No
Adjust throttle position sensor (page F2-151)
Yes: Go to next step
6
STEP 5: Try a known good ECM; and check if condition improves (page F2-141)
Throttle position sensor continuity (STEP 4)
0.15 mm {0.006 in}
ContinuityYes
0.50 mm {0.020 in}
ContinuityNo