4 +8VDC
Inlet Manifold Pressure 10
5 Return A ECM
+8V C Signal
B Return
Inlet Manifold Pressure Sensor
Note : Refer to the Wiring Drawings for full connection details
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Diagnostic codes
Functional test
CID-FMI Conditions which generate this code: Systems Response: Troubleshooting 106-03 Inlet Manifold Pressure Signal Open or
Shorted
The Inlet Manifold Pressure Sensor signal duty cycle is higher than the maximum possible, indicating a possible open or short circuit
AND
An 8 VDC Supply diagnostic code is NOT active.
The engine is shut down. Proceed with P-506: ECM PWM Sensor Circuit Test
106-08 Inlet Manifold Pressure Signal Noisy The Inlet Manifold Pressure Sensor signal duty cycle or frequency is out of range AND
An 8 VDC Supply diagnostic code is NOT active.
The engine is shut down. Proceed with P-506: ECM PWM Sensor Circuit Test
TEST STEP RESULT DIAGNOSIS/ACTION
Step 1: Check For Active +8V Sensor Supply Codes
• Connect TIPPS at the Service Tool Connector.
• Turn the Engine Control Switch to the STOP position.
Wait at least 10 seconds for codes to become Active.
• Verify if any of the following Diagnostic codes are Active:
• - 41-03 8 Volt Supply Above Normal
• - 41-04 8 Volt Supply Below Normal
Are any diagnostic codes listed above Active?
YES ⇒ This procedure will not work if a sensor supply diagnostic code is active.
Refer to P-522: +8V Sensor Voltage Supply Circuit Test. STOP.
NO ⇒ Proceed to next step.
Step 2: Check For Active PWM Sensor Diagnostic codes
• Check if any of the following diagnostic codes are Active:
106-08 (Manifold Pressure Signal INVALID) or 109-08 (Jacket Water Outlet Pressure Sensor Signal INVALID).
Note: Diagnostic Code 41-03 (8 Volt Supply Above Normal) or 41-04 (8 Volt Supply Below Normal) should not be Active.
Are any diagnostic codes listed above Active?
YES ⇒ An OPEN circuit
diagnostic code is Active at this time. Proceed to next step.
NO ⇒ If the codes listed are Logged only, attempt to make the code active by performing a pull test on wires and connectors associated with the circuit. Refer to P-501:
Inspecting Electrical Connectors. STOP.
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64 4016-E61TRS Diagnostic Manual, May 2000
Step 3: Verify Supply Voltage Is Present At The Sensor
• Disconnect the suspect sensor.
• Measure the voltage between pin-A (+8 V) and pin-B (Return) on the engine harness sensor connector.
See Figure P-506.2.
The voltage should measure between 7.5 and 8.5 VDC.
OK ⇒ Supply voltage is present at the sensor. Proceed to next step.
NOT OK ⇒ The +8V Sensor Supply voltage is not reaching the sensor. Most likely there is an OPEN circuit in either the Sensor Common or Sensor Supply wire in the Engine Harness between the ECM and the sensor.
Refer to P-501:
Inspecting Electrical Connectors. STOP.
TEST STEP RESULT DIAGNOSIS/ACTION
A
P506.2HD Connector view Deutsch HD Connectors (Terminal Side)
A
C B
Jack Plug
A B C
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4016-E61TRS Diagnostic Manual, May 2000 65
TEST STEP RESULT DIAGNOSIS/ACTION
Step 4: Check Isolated Signal At The Sensor
• Install a 3-Terminal Breakout-T at the suspect sensor connector.
• Remove the signal wire from the harness side of the Breakout-T to isolate the sensor output.
• Connect a multimeter capable of measuring frequency and duty cycle to pin-C (signal) and pin-B (return) of the Breakout T.
• Turn the Engine Control Switch to the STOP position, if not already done.
• Measure the suspect sensor signal duty cycle and frequency.
The duty cycle should measure between 5 and 95 percent.
The frequency should measure between 400 and 600 Hz.
OK ⇒ Proceed to next step.
NOT OK ⇒ The sensor is receiving a correct supply voltage but is not producing a valid output signal. Thoroughly inspect the sensor connector. Refer to Inspecting Electrical Connectors. Retest the sensor. If the frequency or duty cycle is still incorrect, temporarily replace the sensor (connect a new sensor to the harness, but do not install it into the engine).
Ensure the diagnostic code is no longer Active.
If the diagnostic code disappears when the new sensor is connected, replace the old sensor.
Clear all Logged
diagnostic codes. STOP.
Step 5: Check Isolated Signal At The ECM
• Remove power from the engine control system. Turn the Engine Control Switch to the OFF position and unplug the power connector on the Engine Mounted Panel.
• Disconnect ECM Engine Harness Connector J1/P1.
Thoroughly inspect both halves of the connector for signs of corrosion or moisture. Remove the signal wire from P1 terminal-10.
• Reconnect all connectors and restore power to the engine control system.
• Turn the Engine Control Switch to the STOP position.
• Use a multimeter to measure the suspect sensor signal duty cycle and frequency.
See Figure P-506.3.
The duty cycle should measure between 5 and 95 percent.
The frequency should measure between 400 and 600 Hz.
OK ⇒ A valid signal exists at the ECM connector. Re-insert signal wire into the ECM connector and retest. Verify the ECM is receiving the correct battery voltage. If the problem is not resolved, temporarily connect a test ECM. If the problem disappears with the test ECM connected,
reconnect the old ECM to verify the problem returns. If the test ECM works, and the old one does not, replace the ECM. STOP.
NOT OK ⇒ A valid signal appears at the sensor but not at the ECM connector. Repair or replace the sensor harness as necessary.
Refer to P-501:
Inspecting Electrical Connectors. STOP.
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66 4016-E61TRS Diagnostic Manual, May 2000
A
P506.3ECM Connector terminal locations
Wire Side Terminal Side
ECM Connector P1
Manifold Pressure Return Manifold Pressure Supply
5 4
Function Pin Location
58
Manifold Pressure Signal 10
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