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
5. Using digital multimeter
Continuity - Replace lower cab wiring
426-4 Transmission
(WP 0174), test for continuity
harness (WP 0291).
Neutralizer Pressure Sensor
between connector C-C12
Voltage Is Below Normal or
Proceed to Test Step 4.
(WP 0012, Figure 26) terminal 37
Shorted Low - Continued
No Continuity - Replace transmission
and ground.
ECM (WP 0266).
Proceed to Test Step 3.
Test Step 4. Verify Malfunction Is
Resolved.
1. Ensure all wiring harness
connectors are connected.
2. Install transmission ECM cover
(WP 0266).
3. Install left lower cab access panels
(WP 0347).
4. Using MSD, check for active
Diagnostic Code 426-4 Transmission
diagnostic codes (WP 0008).
Neutralizer Pressure Sensor Voltage
Is Below Normal Becomes Inactive -
Troubleshooting complete.
Diagnostic Code 426-4 Transmission
Neutralizer Pressure Sensor Voltage
Is Below Normal Remains Active -
Repeat troubleshooting from the
beginning.
NOTE
426-5 Transmission
Neutralizer Pressure Sensor
Always inspect wiring harness connectors that are involved in the circuit.
Current Is Below Normal
Poor 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 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 current of transmission neutralizer pressure sensor
is below normal.
POSSIBLE CAUSE
Transmission neutralizer pressure sensor is faulty.
Lower cab wiring harness is open.
Cab ground is open.
Transmission ECM.
