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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 119 (Engine Control System - Basic Diagnostic Procedures) >> No-Start Diagnosis >> No Start - Engine Cranks Okay (3.5L - Intrigue) >> Ignition Relay Diagnosis

Ignition Relay Diagnosis

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn SL2, 2002 Saturn SL1, 2002 Saturn SL, 2002 Saturn SC2, and 2002 Saturn SC1. However, it is still accessible from the selected car via links, so may be relevant.
  1. If diagnostic system check has already been performed, go to next step. If diagnostic system check has not been performed, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in appropriate SELF-DIAGNOSTICS article.
  2. Turn ignition off. Remove underhood fuse block cover. Remove ignition relay. Using a test light connected to ground, probe the battery positive voltage circuit for the ignition relay at underhood fuse block cavity. See WIRING DIAGRAMS article. Does test light illuminate? If yes, go to next step. If no, go to step  10.
  3. Turn ignition on, with engine off. Using test light connected to ground, probe ignition 1 voltage circuit for the ignition relay at the underhood fuse block cavity. Does test light illuminate? If yes, go to next step. If no, go to step  6.
  4. Turn ignition on, with engine off. With test light connected to battery voltage, probe the coil ground circuit for the ignition relay at the underhood fuse block cavity. Does test light illuminate? If yes, go to next step. If no, go to step  7.
  5. Turn ignition off. Using a fused jumper wire, jumper ignition relay battery positive voltage circuit and ignition relay load circuit together at underhood fuse block cavity. Using a test light connected to ground, probe oxygen sensor fuse, fuel injector fuse and Trans solenoid fuse, located in underhood fuse block. Does test light illuminate, go to step  8. If no, go to step  10.
  6. Turn ignition off. Disconnect negative battery terminal. Disconnect the underhood fuse block harness connectors. Check the ignition 1 voltage circuit of ignition relay at underhood fuse block harness connector for an open circuit or a short to ground. Did you find and correct the condition? If yes, go to step  11. If no, go to step  10.
  7. Turn ignition off. Disconnect negative terminal. Disconnect the underhood fuse block harness connectors. Check coil ground circuit of the ignition relay at the underhood fuse block harness connector for a high resistance or for an open circuit. Did you find and correct the condition? If yes, go to step  11. If no, go to step  10.
  8. Inspect for poor terminal contact at ignition relay connector position of the underhood fuse block. Did you find a condition? If yes, go to step  10. If no, go to next step.
  9. Replace ignition relay. After replacing relay, go to step  11.
  10. Replace underhood fuse/relay block. After replacing fuse/relay block, go to next step.
  11. Clear DTCs with scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle for 5 minutes. Does vehicle operate normally, with no Malfunction Indicator Light (MIL) illumination and no stored DTCs? If yes, system is okay. If no, diagnose affected DTC(s). See appropriate SELF-DIAGNOSTICS article.
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