Cold Cranking Test
NOTE:
For complete starter wiring circuit diagrams, refer to SYSTEM WIRING DIAGRAMS
article. The battery must be fully-charged and load-tested before proceeding.
| 1 - POSITIVE CLAMP |
| 2 - NEGATIVE CLAMP |
| 3 - INDUCTION AMMETER CLAMP |
- Connect volt-ampere tester (1) and (2) to battery terminals. See Fig 1. See instructions provided by manufacturer of volt-ampere tester being used.NOTE: Certain diesel equipped models use dual batteries. If equipped with dual battery system, tester should be connected to battery on left side of vehicle only. Also, tester current reading must be taken from positive battery cable lead that connects to starter motor.
- Fully engage parking brake.
- If equipped with manual transmission, place gearshift selector lever in Neutral position and block clutch pedal in fully depressed position. If equipped with automatic transmission, place gearshift selector lever in Park position.
- Verify that all lamps and accessories are turned off.
- To prevent a gasoline engine from starting, remove either the ignition run fuse, or the fuel pump control fuse. To prevent a diesel engine from starting, disconnect the electrical connectors at both the camshaft and crankshaft position sensors.WARNING: Attempt to start engine a few times before proceeding with following step.NOTE: A cold engine will increase starter current (amperage) draw reading, and reduce battery voltage reading.
- Rotate and hold ignition switch in Start position.NOTE: cranking voltage and current (amperage) draw readings shown on volt-ampere tester.
- If voltage reads below 9.6 volts, refer to STARTER MOTOR in Diagnosis and Testing. If starter motor is OK, refer to DIAGNOSIS AND TESTING for 3.7L , DIAGNOSIS AND TESTING for 4.7L and DIAGNOSIS AND TESTING for 5.7L.
- If voltage reads above 9.6 volts and current (amperage) draw reads below specifications, refer to FEED CIRCUIT TEST .
- If voltage reads 12.5 volts or greater and starter motor does not turn, refer to CONTROL CIRCUIT TESTING .
- If voltage reads 12.5 volts or greater and starter motor turns very slowly, refer to FEED CIRCUIT TEST .