TM 5-3805-298-23-1
0091
Table 1. 426 Transmission Neutralizer Pressure Sensor Diagnostic Codes - Continued.
091
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
4. Using MSD, check for active
Diagnostic Code 426-3 Transmission
426-3 Transmission
diagnostic codes (WP 0008).
Neutralizer Pressure Sensor Voltage
Neutralizer Pressure Sensor
Is Above Normal Becomes Inactive -
Voltage Is Above Normal or
Troubleshooting complete.
Shorted High - Continued
Diagnostic Code 426-3 Transmission
Neutralizer Pressure Sensor Voltage
Is Above Normal Remains Active -
Repeat troubleshooting from the
beginning.
NOTE
426-4 Transmission
Neutralizer Pressure Sensor
Always inspect wiring harness connectors that are involved in the circuit.
Voltage Is Below Normal or
Poor connections can often be the cause of a problem in an electrical
Shorted Low
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 wiring harness connection to
identify the correct wiring harness to replace.
Tag all wiring harnesses to aid in installation.
Perform this test only if condition is active.
DIAGNOSTIC CODE SET CONDITION
Transmission ECM detects that voltage for the transmission neutralizer pressure
sensor signal is low.
POSSIBLE CAUSE
Transmission neutralizer pressure sensor is faulty.
Lower cab wiring harness is shorted to ground.
Transmission ECM.
Test Step 1. Check for Active
Diagnostic Codes.
1. Connect MSD. Select
Diagnostic Code 426-4 Active -
Transmission 924H and check for
Proceed to step 2.
active diagnostic codes
Diagnostic Code 426-4 Not Active -
Troubleshooting is complete.
2. Using MSD (WP 0008), check for
Diagnostic Code 262-3 or 262-4
active diagnostic code 262.
Active - Repair diagnostic code 262
first (WP 0005).
Diagnostic Code 262-3 or 262-4 Not
Active - Proceed to Test Step 2.
