4-Cylinder Ignition Timing
- Ignition timing is controlled by Powertrain Control Module (PCM) and is nonadjustable. Manufacturer lists procedure to check base ignition timing.
- Start engine and warm engine until coolant temperature is 176-203°F (80-95°C). Shut engine off. Connect scan tool to Data Link Connector (DLC). DLC is a 16-pin connector located below driver's side of instrument panel, near steering column. See Fig 1 . Scan tool is used to read engine RPM. Connect timing light to cylinder No. 1 for checking ignition timing.
- Start engine and allow engine to idle. Ensure all accessories are off and transaxle is in Park (A/T) or Neutral (M/T). Select No. 22 (CRANKSHAFT POSITION SENSOR) on SCAN TOOL DATA LIST. Ensure idle speed is 650-850 RPM.
- With engine idling, select No. 17 (BASIC IGNITION TIMING) on SCAN TOOL ACTUATOR TEST. Note ignition timing using timing marks at crankshaft pulley and front cover. Ignition timing should be 2-8 degrees BTDC.
- Ignition timing is nonadjustable. If ignition timing is within specification, go to next step. If ignition timing is not within specification, a problem exists in the electronic control system. See appropriate TESTS W/CODES
article for diagnosis of electronic control system. Go to next step.CAUTION: No. 17 (BASIC IGNITION TIMING) on SCAN TOOL ACTUATOR TEST must be canceled, or test will continue for 27 minutes. Driving vehicle under this condition may damage the engine.
- Press clear key on scan tool to cancel No. 17 (BASIC IGNITION TIMING) on SCAN TOOL ACTUATOR TEST. Recheck ignition timing. Ignition timing should be approximately 8 degrees BTDC. Turn ignition off. Remove timing light and scan tool.
NOTE:
Ignition timing should be about 8 degrees BTDC under normal operating conditions. Ignition timing may be advanced 5-8 degrees at higher altitudes.