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Ignition Switch & Circuit Test

  1. Remove driver-side lower instrument panel cover. Remove lower steering column cover. Locate ignition switch wiring connector (8-cavity connector).
  2. Using test light, backprobe White/Green wire terminal of ignition switch wiring connector. If test light glows, go to next step. If test light does not glow, check for blown main fusible link (2.0L) near battery. If fusible link is not blown, check 100-amp ALT and 50-amp AM1 fuses in left side engine compartment fuse/relay block, behind battery. If fuses are okay, check for open in White/Green wire circuit to ignition switch. Repair as required.
  3. Using test light, backprobe Black/White wire terminal of ignition switch connector. Turn ignition switch to START position. If test light does not glow, replace ignition switch.
  4. If test light glows, and vehicle is equipped with A/T without theft deterrent system, go to step 5). If test light glows, and vehicle is equipped with A/T with theft deterrent system, go to step 7) . If test light glows, and vehicle is equipped with M/T with or without theft deterrent system, go to step 11).
  5. Locate neutral start switch on transmission. Check for voltage at Black/White wire terminal of neutral start switch connector with ignition switch turned to START position.
  6. If voltage does not exist, repair Black/White wire circuit as required. If voltage exists, check voltage at Black wire terminal of neutral start switch connector. If voltage does not exist, adjust or replace neutral start switch on transmission. If voltage does exist, repair Black wire circuit between neutral start switch connector and starter as required.
  7. Locate starter relay. See STARTER RELAY LOCATION  table. See Figure and Figure . Check both Black/White wire terminals of starter relay for voltage when ignition switch is turned to START position.. If voltage exists at relay terminals No. 1 and 2, check starter relay for fault. See STARTER RELAY TEST . Replace if required.
    STARTER RELAY LOCATION

    Model Location
    Tercel In Center Console, Left Of Ashtray
  8. If relay checks okay, check Black wiring circuit from starter relay terminal No. 3 to theft deterrent system ECU for open or short. The theft deterrent system ECU provides ground for starter relay terminal No. 3.
  9. If this Black wire ground circuit is good, check Black/Blue wiring circuit from starter relay terminal No. 4 to neutral start switch on transmission. Check for voltage at Black/White wire terminal of neutral start switch connector with ignition switch turned to START position.
  10. If voltage does not exist, repair Black/White wire circuit as required. If voltage does exist, check voltage at Black wire terminal of neutral start switch connector. If voltage does not exist, adjust or replace neutral start switch on transmission. If voltage exists, repair Black wire circuit between neutral start switch connector and starter as required.
  11. On M/T equipped vehicles, if test light glows, locate starter relay. See STARTER RELAY LOCATION  table. See Figure and Figure . Check both Black/White wire terminals of starter relay for voltage when ignition switch is turned to START position. If voltage exists at relay terminals No. 1 and 2, check starter relay for fault. See STARTER RELAY TEST . Replace if required.
  12. If relay checks okay, check Black wiring circuit from starter relay terminal No. 3 to clutch start switch for open or short. On models equipped WITH theft deterrent system, check Black/White wire circuit from clutch start switch connector to theft deterrent system ECU. The theft deterrent system ECU provides ground for starter relay terminal No. 3. If this Black/White wire ground circuit is good, check Black or Black/Blue wiring circuit from starter relay terminal No. 4 to starter for open or short. Repair as required. If no faults are found, problem is in theft deterrent system ECU or starter.
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