BRACKET ASSEM. 2V9748 - Caterpillar

Illustration 1 g01405556
Schematic of the sensor circuit for the PWM sensors
Illustration 2 g01406331
Locations of the left side exhaust temperature sensors
(1) "FRONT LEFT EXHAUST TC"
(2) "REAR LEFT EXHAUST TC" Test Step 1. Inspect the Electrical Connectors and the Wiring
Illustration 3 g01406077
Location of the ECM connector that is for the exhaust temperature sensors
(3) J2/P2 ECM connectors
Thoroughly inspect connectors (1), (2) and (3). Refer to Troubleshooting, "Electrical Connectors - Inspect" for details that are related to inspection of the electrical connectors.
Illustration 4 g01406078
Terminal locations at the P2 ECM connector that are for the exhaust temperature sensor
(P2-29) Digital sensor supply
(P2-39) Front left exhaust temperature
(P2-49) Front right exhaust temperature
(P2-65) Rear left exhaust temperature
(P2-73) Rear right exhaust temperature
(P2-93) Digital return
Illustration 5 g01159881
Terminal locations at the connectors for the exhaust temperature sensor
(Terminal A) Digital sensor supply
(Terminal B) Digital return
(Terminal C) Exhaust temperature
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the customer connector that are associated with the circuit.
Check the allen head screw on each ECM connector for the proper torque. refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The connectors and wiring appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not OK.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Check the Supply Voltage at the Sensor
Disconnect the exhaust temperature sensor at the harness connector.
Restore electrical power to the ECM. Turn the keyswitch to the ON position.
Measure the voltage across terminal A (digital sensor supply) and terminal B (digital return) on the harness side of the connector.
Remove electrical power from the ECM. Turn the keyswitch to the OFF position.
Restore the wiring to the original configuration. Expected Result:The supply voltage measures 8.0 0.4 VDC at the sensor connector.Results:
OK - The correct supply voltage is measured at the sensor connector. The sensor is receiving the correct supply voltage. Proceed to Test Step 3.
Not OK - The voltage is not correct at the sensor connector.Repair: There is a problem in the circuit for the digital sensor supply that is between the ECM and the exhaust temperature sensor. Repair the circuit. Refer to Troubleshooting, "Digital Sensor Supply Circuit - Test" for details that are related to troubleshooting a problem with the circuit.STOPTest Step 3. Check the Signal Frequency and the Duty Cycle at the Sensor
Disconnect the sensor connector from the exhaust temperature sensor.
Remove the signal wire from terminal C of the harness side of the connector for the exhaust temperature sensor.
Install a 7X-6370 Adapter Cable As (3-PIN BREAKOUT) at the sensor connector.
Connect the sensor to the breakout harness.
Restore electrical power to the ECM. Turn the keyswitch to the ON position.
Measure the frequency and the duty cycle between terminal B (digital return) and terminal C (exhaust temperature) at