PINION (13 Teeth) 2V0816 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the power to the engine's Electronic Control Module (ECM) or if any one of the diagnostic codes in Table 1 is active or easily repeated. Refer to Troubleshooting, "Event Code List" for the default conditions for event codes.
Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
E043(1) Low System Voltage The battery voltage to the ECM is less than normal. The code is logged.
168-0 System Voltage HIgh The battery supply voltage is greater than 32 VDC for two seconds.
The engine's ECM has been powered for three seconds.
The engine is not being cranked.
168-1 System Voltage Low The battery supply voltage is less than 9 VDC for two seconds.
The engine's ECM has been powered for three seconds.
The engine is not being cranked.
168-2 System Voltage intermittent/erratic The engine is running. The battery voltage falls below 9 VDC for at least .06 seconds. The voltage returns above 9 VDC.
or
Three voltage readings in the last seven seconds were below 9 VDC. The electrical power for the engine comes through a 16 amp circuit breaker, the Engine Control Switch (ECS), and the Electronic Control Module (ECM). The system receives battery voltage when the ECS is in the AUTO, START or STOP positions. A signal is provided to the ECM that senses the position of the ECS. When the ECM senses battery voltage on this input, the ECM will power up. If the voltage is removed from the input, the ECM will power down.An emergency stop for engine operation is provided in the starting system. Power to the ECM flows through the breaker for the ECM and the ECM relay. The ECM relay is energized when the ECS is in the AUTO, START or STOP positions and the emergency stop button is not activated. When the emergency stop button is activated, power is removed from the coil of the ECM relay. The contacts of the ECM relay open removing the power to the ECM.The presence of two +Battery connections and two −Battery connections to the ECM reduce harness resistance. All of these connections must be complete in order to ensure proper engine operation.With intermittent faults, you may want to bypass the engine wiring. Bypassing the wiring helps to locate the problem. If the problem is no longer present with the bypass in place, the engine wiring is faulty.
Illustration 1 g01218323
Typical schematic
Illustration 2 g01218324
P1 ECM connector
(P1-52) +Battery
(P1-53) +Battery
(P1-63) −Battery
(P1-65) −Battery
(P1-70) Keyswitch
Illustration 3 g01218327
"Connector A"
(Terminal 7) +Battery
(Terminal 9) +Battery
(Terminal 11) −Battery
(Terminal 13) −Battery
Illustration 4 g01234146
Location of ECM connectors
Illustration 5 g01218329
"Connector B"
(Terminal 13) Keyswitch Test Step 1. Inspect Electrical Connectors and Wiring
Remove electrical power from the ECM.
Thoroughly inspect the ECM connectors J1/P1. Inspect all of the other connectors. Refer to