Starter Solenoid Does Not Click 7.2L (LG5) Caterpillar Diesel
Step | Action | Yes | No | ||||
|---|---|---|---|---|---|---|---|
Schematic Reference: Starting and Charging Schematics | |||||||
1 | Did you preform the Engine Electrical Diagnostic System Check? | ||||||
2 | Turn the ignition switch to the START position. Does the engine crank? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |||||
3 | Turn the ignition switch to the START position. Does the starter motor relay click? | ||||||
4 |
Does the test light illuminate? | ||||||
5 |
Does the test light illuminate? | ||||||
6 | Is the starter equipped with over crank protection (OCP) thermal switch? | ||||||
7 |
Does the test lamp illuminate? | ||||||
8 |
Does the test lamp illuminate? | ||||||
9 |
Does the test lamp illuminate? | ||||||
10 | Connect a 30 amp fused jumper between the battery positive voltage circuit of the starter motor relay switch circuit and the supply voltage circuit of the starter solenoid. Does the engine crank? | ||||||
11 | Does the fuse in the jumper open? | ||||||
12 | Test the control circuit of the starter motor relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | ||||||
13 | Test the supply voltage circuit of the starter motor relay coil circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | ||||||
14 | Test the supply voltage circuit of the starter solenoid for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | ||||||
15 | Inspect for poor connections at the starter motor relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | ||||||
16 |
Did you find and correct the condition? | ||||||
17 | Inspect for poor connections at the ignition switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | ||||||
18 | Inspect for poor connections at the starter thermal switch/solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | ||||||
19 | Repair the open or high resistance in the battery positive voltage circuit of the Starter Motor relay switch circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | |||||
20 | Repair the short to ground in the supply voltage circuit of the starter solenoid. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | |||||
21 | Replace the starter motor relay. Did you complete the replacement? | -- | |||||
22 | Replace the:
Did you complete the replacement? | -- | |||||
23 | Replace the Ignition Switch. Refer to Ignition Switch Replacement - On Vehicle (Standard Column) in Steering Wheel and Column. Did you complete the replacement? | -- | |||||
24 | Replace the starter. Refer to Starter Motor Replacement . Did you complete the replacement? | -- | |||||
25 | Operate the system for which the symptom occurred. Did you correct the condition? | System OK | |||||
Starter Solenoid Does Not Click 8.1L (L18)
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Starting and Charging Schematics | |||
1 | Did you preform the Engine Electrical Diagnostic System Check? | ||
2 | Turn the ignition switch to the START position. Does the engine crank? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |
3 | Turn the ignition switch to the START position. Does the starter motor relay click? | ||
4 |
Does the scan tool display Yes? | ||
5 |
Does the scan toll diaplay Park/Neutral? | ||
6 | Is the starter equipped with over crank protection (OCP) thermal switch? | ||
7 |
Does the engine crank? | ||
8 |
Does the scan toll display Yes for Crank Request Signal? | ||
9 |
Does the scan tool diaplay Park/Neutral? | ||
10 |
Does the test lamp illuminate? | ||
11 | Connect a 30 amp fused jumper between the battery positive voltage circuit of the starter motor relay switch circuit and the supply voltage circuit of the starter solenoid. Does the engine crank? | ||
12 | Does the fuse in the jumper open? | ||
13 | Test the neutral switch signal and ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | ||
14 | Test the control circuit of the starter motor relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | ||
15 | Test the supply voltage circuit of the starter motor relay coil circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | ||
16 | Test the supply voltage circuit of the starter solenoid for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | ||
17 | Inspect for poor connections at the starter motor relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | ||
18 | If equipped with a Manual Transmission inspect for poor connection at the Clutch/Starter Interlock Switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | ||
19 | Inspect for poor connections at the ignition switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | ||
20 | Inspect for poor connections at the starter therminal switch/solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | ||
21 | Inspect for poor connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | |
22 | Repair the open or high resistance in the battery positive voltage circuit of the Starter Motor relay switch circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | |
23 | Repair the short to ground in the supply voltage circuit of the starter solenoid. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | |
24 | Replace the starter motor relay. Did you complete the replacement? | -- | |
25 | Replace the Clutch/Starter Interlock Switch. Refer to Clutch Pedal Engine Start Switch Replacement in Clutch. Did you complete the replacement? | -- | |
26 | Replace the Ignition Switch. Refer to Ignition Switch Replacement - On Vehicle in Steering Wheel and Column. Did you complete the replacement? | -- | |
27 | Replace the starter. Refer to Starter Motor Replacement . Did you complete the replacement? | -- | |
28 |
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement 8.1L in Engine Controls. Did you complete the repair? | -- | |
29 | Operate the system for which the symptom occurred. Did you correct the condition? | System OK | |
