TM 5-3805-298-23-1
0049
Table 1. 91 Throttle Position Sensor Diagnostic Codes - Continued.
049
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
4. Using MSD, check for active
91-3 Throttle Position
Diagnostic Code 91-3 Throttle
diagnostic codes (WP 0008).
Sensor Signal Voltage Is
Position Sensor Signal Voltage
Above Normal or the
Above Normal Becomes Inactive -
Troubleshooting complete.
Voltage Is Shorted High -
Continued
Diagnostic Code 91-3 Throttle
Position Sensor Signal Voltage
Above Normal Remains Active -
Repeat troubleshooting from the
beginning.
NOTE
91-4 Throttle Position
Sensor Signal Voltage Is
Always inspect wiring harness connectors that are involved in the circuit.
Below Normal or the Voltage
Poor connections can often be the cause of a problem in an electrical
Is 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
Engine electronic control module (ECM) detects signal voltage for the throttle
position is below the diagnostic lower limit that is set for the application.
POSSIBLE CAUSE
Engine wiring harness is shorted to ground.
Lower cab wiring harness is shorted to ground.
Engine ECM.
Test Step 1. Check for Active
Diagnostic Codes.
1. Connect MSD and select C6.6 924
2. Start engine or attempt to start
Diagnostic Code 91-4 Active -
engine (TM 5-3805-298-10) while
Proceed to step 3.
using MSD to check for active
Diagnostic Code 91-4 Not Active -
diagnostic codes (WP 0008).
Troubleshooting is complete.
3. Using MSD (WP 0008), check for
Diagnostic Code 41-3 or 41-4 Active
active engine diagnostic code 41.
- Repair diagnostic code 41 first
Diagnostic Code 41-3 or 41-4 Not
Active - Proceed to Test Step 2.
