TROUBLE SHOOTING
Note. For "engine not cranking" condition on A/T, determine if condition exists in both Park and Neutral. If condition occurs in one position and not other, manual lever position sensor is probable cause. See TRANSMISSION SERVICING - A/T article in the AUTOMATIC TRANS SERVICE section.
ON-VEHICLE TESTING
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery. |
STARTER LOAD TEST
- Connect starter load tester and voltmeter to battery terminals. Ensure no current is flowing through the ammeter and carbon pile of tester. Disconnect terminal "S" of starter relay. (Scheme 2)
- Connect remote starter switch between terminal "S" and positive battery terminal. Ensure transmission is in Park on A/T models, or Neutral on M/T models.
- Crank engine with ignition off. Note voltmeter indication, then stop cranking engine. Adjust carbon pile to match voltage obtained while cranking. Read ammeter. Replace or repair starter if current exceeds specification. See «STARTER SPECIFICATIONS»(ref-58605-S36875638632001011700000).
Scheme 2
STARTER CIRCUIT VOLTAGE DROP TEST
Note. If starter cranks slowly and battery is okay, perform following test.
- Check engine ground strap and negative battery cable connections and repair as necessary. Prevent engine from starting by disabling ignition system. Ensure transmission is in Park or Neutral. Connect remote control starter switch between starter solenoid "S" terminal and positive battery terminal. (Scheme 2)
- Connect voltmeter positive lead to positive battery terminal. Connect voltmeter negative lead to "M" terminal on starter solenoid. (Scheme 2) Crank engine using remote starter switch while observing voltmeter. If voltmeter reads greater than 0.5 volt, go to next step. If voltmeter reading is less than 0.5 volt, starter feed circuit is okay, repair or replace starter.
- Move voltmeter negative lead to "B" terminal on starter solenoid. Crank engine and record voltmeter reading. If voltmeter reading is still greater than 0.5 volt, excessive resistance is present in positive battery cable or cable connections. If voltmeter reads less than 0.5 volt at "B" terminal, check cable connections at starter solenoid. If okay, replace starter solenoid.
STARTER NO-LOAD TEST
- Connect starting system test equipment following manufacturer instructions. (Scheme 3) Ensure carbon pile rheostat of starter tester is turned off.
- Connect heavy wire between negative battery terminal and starter frame. Connect another heavy wire between positive battery terminal and "B" terminal of starter solenoid. CAUTION: Ensure starter is securely mounted in vise while energizing as starter will move or jump.
- Connect a jumper wire between battery positive terminal and "S" terminal on starter solenoid. (Scheme 2) Ensure starter drive ejects completely and starter spins rapidly. Observe ammeter reading.
- If ammeter is not available, note voltage reading while testing. Using carbon pile load tester, apply load until voltmeter reading is equal to test voltage. Read amperage on carbon pile tester. Replace starter if current draw is more than specified. See «STARTER SPECIFICATIONS»(ref-58605-S36875638632001011700000).
Scheme 3
ARMATURE GROUNDED CIRCUIT TEST
Using an ohmmeter, check for continuity between any commutator segment and armature laminations. (Scheme 4) If ohmmeter indicates less than infinite resistance, armature is shorted and must be replaced.
