Ignition Timing: AERIO
WARNING: This page is about a different car, the 2003 Suzuki XL-7, 2003 Suzuki Vitara, 2003 Suzuki Grand Vitara, and 2003 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition switch to LOCK position. Ensure transmission is in Neutral or Park. Set parking brake. Remove timing hole cover, located on transaxle bell housing. See Fig 1 .
- Connect Suzuki scan tool to Data Link Connector (DLC), located under left side of instrument panel. See Fig 2 . Start engine and allow it to reach normal operating temperature. Turn all accessories off. Ensure idle speed is correct. See IDLE SPEED under IDLE SPEED & MIXTURE. On scan tool, select MISC mode and fix ignition timing by selecting FIXED SPARK mode. Set timing light to No. 1 ignition coil harness. Aim timing light at timing mark and check ignition timing. See Fig 3 . Ignition timing should be 4-6 degrees BTDC (at idle speed). If timing is not as specified, go to next step.
- Loosen Camshaft Position (CMP) sensor bolts and turn CMP sensor until timing marks line up. See Fig 4
. With engine idling, end FIXED SPARK MODE. Use timing light to verify that ignition timing varies more or less of initial ignition timing (about 8 degrees), indicating proper operation of electronic timing system. Also, check that timing advances when increasing engine speed. If results are not as specified, check the following for proper operation:
- Throttle Position Sensor (TPS). See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article.
- Test Switch Signal Circuit. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
- Engine Control Module (ECM). See ENGINE CONTROL MODULE under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article.