TM 5-3805-296-23-2
0091
Table 1. 1840 Tractor Parking Brake Pressure Switch Diagnostic Codes.
0091
CID FMI
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
1840-03 Tractor Parking
Brake Pressure Switch
Always inspect harness connectors that are involved in the circuit. Poor
Voltage Above Normal
connections can often be the cause of a problem in an electrical circuit.
Verify that all connections in the circuit are clean and secure and that all
connections are in good condition. If a problem with the connection is
found, correct the problem and verify that this malfunction or diagnostic
code is active before performing this procedure.
Perform open or short-circuit test at each harness connection to identify
the correct harness to replace.
Tag all wiring harnesses to aid in installation.
Perform this test only if condition is active.
DIAGNOSTIC CODE SET CONDITION
Transmission/Chassis ECM Detects Above Normal Voltage on Trac/S Park Brake
Press Circuit 419.
POSSIBLE CAUSE
Transmission Wiring Harness High Resistance, Open, or Shorted.
Chassis Wiring Harness High Resistance, Open, or Shorted.
Main Cab Wiring Harness High Resistance, Open, or Shorted.
Tractor Park Brake Pressure Switch
Transmission/Chassis ECM.
Test Step 1. Test Tractor Park Brake
Pressure Switch.
NOTE
Verify parking brake is ON before performing this test
(TM 5-3805-296-10).
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
2. Disconnect connector A-C4
(WP 0012, Figure 125) from tractor
park brake pressure switch
connector (WP 0012, Figure 124).
