Pinpoint Test Q: DTC C1742 Or DTC C1743
Parking Aid - Mountaineer, Explorer Sport Trac
Pinpoint Tests
Pinpoint Test Q: DTC C1742 Or DTC C1743
Refer to Wiring Diagram Set 131, Parking Aid for schematic and connector information. Diagrams By Number
Normal Operation
A variable rate warning tone is generated from a parking aid speaker. The parking aid speaker increases the warning tone rate as the vehicle gets closer to an obstacle.
- DTC C1742 (Rear Sounder Circuit Failure) - sets when the sounder circuit is open or shorted to ground.
- DTC C1743 (Rear Sounder Circuit Short to Vbatt) - sets when the sounder circuit is shorted to voltage.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Parking Aid Module (PAM)
- Parking aid speaker
PINPOINT TEST Q: DTC C1742 OR DTC C1743
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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Q1 USE THE RECORDED DTCs FROM THE PAM SELF-TEST
- Use the recorded results from the PAM self-test.
- Is DTC C1742 or DTC C1743 recorded?
Yes
GO to Q2.
No
All other DTCs, GO to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
If no DTCs are recorded, GO to Pinpoint Test L. Pinpoint Test L: The Parking Aid Is Inoperative/Does Not Operate Correctly
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Q2 MEASURE THE PARKING AID SPEAKER RESISTANCE
- Ignition OFF.
- Disconnect: Parking Aid Speaker C4015 (Mountaineer) or C3268 (Explorer Sport Trac).
- Measure the resistance between the parking aid speaker pin 1, component side, and the parking aid speaker pin 2, component side.
- Is the resistance between 40 and 60 ohms?
Yes
If DTC C1742 was recorded, GO to Q3.
If DTC C1743 was recorded, GO to Q8.
No
INSTALL a new parking aid speaker. REFER to Parking Aid Module (PAM) - Mountaineer Service and Repair or Parking Aid Module (PAM) - Explorer Sport Trac Service and Repair. CLEAR the DTCs. TEST the system for normal operation.
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Q3 MEASURE THE PARKING AID SPEAKER CIRCUITS FOR A SHORT TOGETHER
- Measure the resistance between the parking aid speaker C4015-2 (Mountaineer) or C3268-2 (Explorer Sport Trac), circuit CMP09 (BN/BU), harness side and the parking aid speaker C4015-1 (Mountaineer) or C3268-1 (Explorer Sport Trac), circuit RMP09 (BU/GN), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to Q4.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
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Q4 CHECK THE PARKING AID SPEAKER (+) CIRCUIT FOR A SHORT TO GROUND
- Connect: Parking Aid Speaker C4015.
- Disconnect: PAM C4014 (Mountaineer) or C3267 (Explorer Sport Trac).
- Measure the resistance between the PAM, C4014-2 (Mountaineer) or C3267-2 (Explorer Sport Trac), circuit CMP09 (BN/BU), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to Q6.
No
GO to Q5.
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Q5 CHECK THE PARKING AID SPEAKER (+) CIRCUIT FOR A SHORT TO GROUND WITH THE PARKING AID SPEAKER DISCONNECTED
- Disconnect: Parking Aid Speaker C4015 (Mountaineer) or C3268 (Explorer Sport Trac).
- Measure the resistance between the PAM C4014-2 (Mountaineer) or C3267-2 (Explorer Sport Trac), circuit CMP09 (BN/BU), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
REPAIR circuit RMP09 (BU/GN). CLEAR the DTCs. TEST the system for normal operation.
No
REPAIR circuit CMP09 (BN/BU). CLEAR the DTCs. TEST the system for normal operation.
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Q6 CHECK THE PARKING AID SPEAKER (+) CIRCUIT FOR AN OPEN
- Disconnect: Parking Aid Speaker C4015 (Mountaineer) or C3268 (Explorer Sport Trac).
- Measure the resistance between the parking aid speaker C4015-2 (Mountaineer) or C3268-2 (Explorer Sport Trac, circuit CMP09 (BN/BU), harness side and the PAM C4014-2 (Mountaineer) or C3267-2 (Explorer Sport Trac), circuit CMP09 (BN/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to Q7.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
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Q7 CHECK THE PARKING AID SPEAKER (-) CIRCUIT FOR AN OPEN
- Measure the resistance between the parking aid speaker C4015-1 (Mountaineer) C3268-1 (Explorer Sport Trac), circuit RMP09 (BU/GN), harness side and the PAM C4014-6 (Mountaineer) or C3267-6 (Explorer Sport Trac), circuit RMP09 (BU/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to Q9.
No
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
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Q8 CHECK THE PARKING AID SPEAKER CIRCUITRY FOR A SHORT TO VOLTAGE
- Disconnect: PAM C4014 (Mountaineer) or C3267 (Explorer Sport Trac).
- Ignition ON.
- Measure the voltage between the PAM, C4014-2 (Mountaineer) or C3267-2 (Explorer Sport Trac), circuit CMP09 (BN/BU), harness side and ground; and between the PAM, C4014-6 (Mountaineer) or C3267-6 (Explorer Sport Trac), circuit RMP09 (BU/GN), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit in question. CLEAR the DTCs. TEST the system for normal operation.
No
GO to Q9.
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Q9 CHECK FOR CORRECT PAM OPERATION
- Disconnect the PAM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the PAM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new PAM. REFER to Parking Aid Module (PAM) - Mountaineer Service and Repair or Parking Aid Module (PAM) - Explorer Sport Trac Service and Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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