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
2. Using digital multimeter
91-8 Throttle Position
Resistance 5.0 Ohms or Less -
(WP 0174), measure resistance
Replace engine wiring harness
Sensor Abnormal
between connector C-C18
(WP 0299).
Frequency, Pulse Width, or
(WP 0012, Figure 13) terminal 13
Period - Continued
Proceed to Test Step 14.
and terminal 19.
Resistance Greater Than 5.0 Ohms -
Replace lower cab wiring harness
(WP 0291).
Proceed to Test Step 14.
Test Step 14. Verify Malfunction Is
Resolved.
1. Ensure all wiring harness
connectors are connected.
2. Start engine and operate governor
control pedal (TM 5-3805-298-10).
3. At MSD, check for active
Diagnostic Code 91-8 Throttle
diagnostic codes (WP 0008).
Position Sensor Abnormal
Frequency, Pulse Width, or Period
Becomes Inactive - Troubleshooting
complete.
Diagnostic Code 91-8 Throttle
Position Sensor Abnormal
Frequency, Pulse Width, or Period
Remains Active - Repeat
troubleshooting from the beginning.
NOTE
91-12 Throttle Position
Sensor Is Damaged
Always inspect wiring harness connectors that are involved in the circuit.
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
Engine ECM detects 8 Volt power supply to the throttle position sensor has
failed.
POSSIBLE CAUSE
Engine wiring harness is open.
Lower cab wiring harness is open.
Throttle position sensor is faulty.
Engine ECM.
