HARNESS AS-CAB 5043600 - Caterpillar

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Terminal locations at the P1 ECM connector that are for the sensors for the turbocharger turbine inlet temperature
(P1-5) Digital return
(P1-18) Digital return
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Terminal locations at the P2 ECM connector that are for the sensors for the turbocharger turbine inlet temperature
(P2-29) Digital supply
(P2-65) Left turbocharger turbine inlet temperature
(P2-73) Right turbocharger turbine inlet temperature
(P2-92) Digital return
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Terminal locations at the left rail connector that are for the sensors for the turbocharger turbine inlet temperature
(Terminal 49) Left turbocharger turbine inlet temperature
(Terminal 63) Digital supply
(Terminal 69) Digital return
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Terminal locations at the right rail connector that are for the sensors for the turbocharger turbine inlet temperature
(Terminal 49) Right turbocharger turbine inlet temperature
(Terminal 63) Digital supply
(Terminal 69) Digital return
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Sensor connector
(Terminal 1) Sensor supply
(Terminal 2) Sensor return
(Terminal 3) Signal Test Step 1. Check for an "Active" Diagnostic Code
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Monitor the diagnostic codes on Cat ET. Check and record any diagnostic codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Determine if a diagnostic code has occurred several times. Note: A diagnostic code that is logged several times is an indication of an intermittent problem. Most intermittent problems are the result of a bad connection between a socket and a pin in a connector or a bad connection between a wire and a terminal.
Look for one or more of the following diagnostic codes that are active or logged:
1491-03
1491-04
1491-08
1492-03
1492-04
1492-08Expected Result:No diagnostic code is active for the exhaust temperature sensors.Results:
OK - No diagnostic codes are active.Repair: There may be an intermittent problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct procedures for inspecting electrical connectors.STOP
Not OK - One of the diagnostic codes that are listed above are active or logged. The ECM detects a problem in one of the circuits for the exhaust temperature sensors. Proceed to Test Step 2.Test Step 2. Check the Digital Supply Voltage at the Sensor Connector
Remove the electrical power from the ECM.
Disconnect the suspect sensor at the sensor connector:
Restore the electrical power to the ECM.
Measure the supply voltage on the harness side of the sensor connector. Measure the voltage between terminal 1 and terminal 2 for the suspect sensor. Expected Result:The supply voltage is 8.0 0.4 VDC.Results:
OK - The supply voltage is 8.0 0.4 VDC. The supply voltage is reaching the sensor connector. Proceed to Test Step 4.
Not OK - The supply voltage is not 8.0 0.4 VDC. The supply voltage is not reaching the sensor connector. Proceed to Test Step 3.Test Step 3. Check the Digital Supply Voltage at the ECM
Remove the electrical power from the ECM.
Disconnect the J2/P2 ECM connectors.
Fabricate two jumper wires that are long enough to use as test leads at the ECM connector. Crimp connector sockets to one end of each of the jumper wires.
Remove the wires for the digital supply from terminal locations P2-29 and P2-92. Install a jumper wire into each