VALVE GP-SOLENOID & RELIEF 5046730 - Caterpillar

Table 1
Information Display (MID 304)    
DTC    Code Description    System Response    
1426-3     Rear Warning Lamp: Voltage Above Normal     Rear Warning Lamp will not function.    
1426-4     Rear Warning Lamp: Voltage Below Normal     Rear Warning Lamp will not function.    
1426-5     Rear Warning Lamp: Current Below Normal     Rear Warning Lamp will not function.    Possible Causes for an FMI 3 Diagnostic code are:
The Rear Warning Lamp has failed.
The energize circuit of the Rear Warning Lamp is shorted to +battery.
The Information Display has failed. This situation is unlikely.
Possible Causes for an FMI 4 Diagnostic code are:
The Rear Warning Lamp has failed.
The signal circuit for the Rear Warning Lamp is shorted to ground.
The Information Display has failed. This situation is unlikely.
Possible Causes for an FMI 5 Diagnostic code are:
The Rear Warning Lamp has failed.
The signal circuit for the Rear Warning Lamp is shorted to ground.
The Information Display has failed. This situation is unlikely.
Illustration 1 g03594597
Schematic of the indicator lamp circuits associated with the Switch Panel.Note: The diagram above is a simplified schematic of the Information Display and the Rear Warning Lamp connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, KENR5639 for the complete schematic.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Identify Active FMI Code Associated With Indicator Lamp Circuit    
Code present.     FMI 3 diagnostic code, proceed to Test Step 2.
FMI 4 diagnostic code, proceed to Test Step 3.
FMI 5 diagnostic code, proceed to Test Step 5.    
Begin Process For FMI 3 Troubleshooting HERE    
2. Check The Harness For A Short
A. Turn key