Perkins 1106D Troubleshooting Manual page 126

126
Troubleshooting Section
Expected Result:
A "Voltage Below Normal" diagnostic code for the
disconnected sensor is now active.
Results:
•
OK – A "Voltage Above Normal" diagnostic code
was active before disconnecting the sensor. An
"Voltage Below Normal" diagnostic code became
active after disconnecting the sensor. Proceed to
Test Step 6.
•
Not OK – There is a short circuit between the
sensor connector on the harness and the ECM.
Leave the sensor disconnected. Proceed to Test
Step 8.
Test Step 5. Measure the Sensor Supply
Voltage
A. Turn the keyswitch to the OFF position.
B. Disconnect the sensor from the engine harness.
C. Turn the keyswitch to the ON position.
D. Measure the voltage at the plug for the sensor
from the terminal 1 (pressure sensor supply) to
terminal 2 (sensor common).
Expected Result:
The DC voltage from terminal 1 to terminal 2
measures 4.84 to 5.16 Volts DC.
Results:
•
OK – The sensor supply voltage is correct.
Proceed to Test Step 7.
•
Not OK – The sensor supply voltage is out of the
nominal range. Continue testing the sensor supply
circuit.
Repair: Proceed to the following repair:
Troubleshooting, "5 Volt Sensor Supply Circuit -
Test"
STOP.
Test Step 6. Determine If The Short
Circuit Is In The Connector Or In The
Sensor
A. Thoroughly inspect the connector for moisture.
B. Inspect the seals and reconnect the sensor.
C. Refer to Troubleshooting, "Electrical Connectors
- Inspect".
This document is printed from SPI². Not for RESALE
D. If the short circuit diagnostic code reappears, the
sensor or the sensor connector has a fault.
a. Temporarily connect a new sensor to the
harness, but do not install the new sensor in
the engine.
E. Use the electronic service tool to check for a short
circuit diagnostic code. The new sensor should be
connected to the harness at this time.
Expected Result:
The short circuit diagnostic code is not present when
a new sensor is connected.
Results:
•
OK – Use the electronic service tool in order to
clear all logged diagnostic codes and then verify
that the repair eliminates the fault. STOP.
•
Not OK – Repair the engine harness connector.
Use the electronic service tool to clear the logged
diagnostic codes. STOP.
Test Step 7. Create a Short Circuit
Between the Signal and the Common
Terminals at the Engine Harness
Connector
A. Turn the keyswitch to the ON position.
B. Fabricate a jumper wire 150 mm (6 inch) long.
Crimp a terminal to both ends of the wire.
C. Monitor the "Active Diagnostic Code" screen on
the electronic service tool before installing the
jumper wire and after installing the jumper wire.
D. Install the jumper on the engine harness
connector. Install one end of the jumper at the
sensor signal (terminal 3). Install the other end
of the jumper at the common connection for
the pressure sensor (terminal 2). Wait at least
30 seconds for activation of the short circuit
diagnostic code.
Expected Result:
A short circuit diagnostic code is active when the
jumper is installed. An open circuit diagnostic code is
active when the jumper is removed.
Results:
•
OK – The engine harness and the ECM are OK.
Repair: Perform the following repair:
1. Temporarily connect the suspect sensor.
KENR6201-01