BIT GP-END 4T5504 - Caterpillar

Table 3
Coolant Temperature Sensor Resistance
20° C (68° F) 2.0k Ohms to 3.0k Ohms
40° C (104° F) 0.9k Ohms to 1.5k Ohms
60° C (140° F) 0.4k Ohms to 0.8k Ohms
80° C (176° F) 0.2k Ohms to 0.4k Ohms
Table 4
Troubleshooting Test Steps Values Results
3. Check the Inlet Manifold Temperature Sensor
A. Turn the keyswitch to the OFF position.
B. Disconnect the harness connector from the inlet manifold temperature sensor.
C. Measure the resistance between pins 1 and 2 on the inlet manifold temperature sensor. Compare the results to Table 5.
8k Ohms to 37k Ohms
Result: The resistance measurement is outside limits.
Repair: Install a replacement inlet manifold temperature sensor.
Clear the diagnostic code and confirm that the fault has been eliminated.
Result: The resistance measurement is within limits.
For an XXX-3 code, proceed to Test Step 5.
For an XXX-4 code, proceed to Test Step 6.
Table 5
Ambient Temperature Sensor Resistance
0° C (32° F) 31k Ohms to 37k Ohms
20° C (68° F) 17k Ohms to 23k Ohms
60° C (140° F) 8k Ohms to 10k Ohms
Table 6
Troubleshooting Test Steps Values Results
4. Check the Suspect DOC Temperature Sensor
A. Turn the keyswitch to the OFF position.
B. Disconnect the harness connector from the suspect DOC temperature sensor.
C. Measure the resistance between pins 1 and 2 on the suspect DOC temperature sensor. Compare the results to Table 7.
8k Ohms to 37k Ohms
Result: The resistance measurement is outside limits.
Repair: Install a replacement DOC temperature sensor.
Clear the diagnostic code and confirm that the fault has been eliminated.
Result: The resistance measurement is within limits.
For an XXX-3 code, proceed to Test Step 5.
For an XXX-4 code, proceed to Test Step 6.
Table 7
Ambient Temperature Sensor Resistance
0° C (32° F) 220k Ohms
20° C (68° F) 118k Ohms
40° C (104° F) 69k Ohms
Table 8
Troubleshooting Test Steps Values Results
5. Check the Wiring between the Suspect Temperature Sensor and the ECM for an Open Circuit
Refer to Illustration 1.
A. Turn the keyswitch to the OFF position.
B. Disconnect the harness connector from the suspect temperature sensor.
C. Disconnect the engine interface connector.
D. Disconnect the P1