Detonation sensors schematic
Step 2: Check For Active Detonation Sensor Diagnostic codes
• Check if any of the following diagnostic codes are Active:
1501, 1505, 1509, 1513, 1502, 1506, 1510, 1514 (03 or 04).
Note: Diagnostic Code 41-04 (8 Volt Supply Above Normal) or 41-04 (8 Volt Supply Below Normal) should not be Active.
Are any diagnostic codes listed above Active?
ACTIVE SHORT (FMI=04)
⇒ A SHORTED LOW diagnostic code is Active at this time. Proceed to next step.
ACTIVE OPEN (FMI=03)
⇒ An OPEN OR SHORTED HIGH diagnostic code is Active at this time.
Proceed to Step 4.
NO ⇒ If the codes listed are Logged only and the engine is currently NOT running properly, refer to Troubleshooting Without A Diagnostic Code. If the engine is running properly at this time, there may be an intermittent problem in the harness causing the Logged codes. Refer to P-501: Inspecting Electrical Connectors.
STOP.
Step 3: Disconnect Sensor To Create An Open Circuit
• Turn the Engine Control Switch to the OFF position.
• Disconnect the sensor with the SHORT circuit diagnostic code.
• Attempt to start the engine.
Note: If the engine starts, it will normally shut down within 10 seconds due to the Detonation Sensor diagnostic code.
If the engine will not start, crank the engine continuously for at least 10 seconds to allow the ECM to register Detonation Sensor Diagnostic codes.
• Access the Active Diagnostic Code Screen of the Electronic Service Tool. Check for Active Detonation Sensor OPEN Circuit 1501-03, 1505-03, 1509-03, 1513-03, 1502-03, 1506-03, 1510-03, 1514-03 diagnostic codes.
An OPEN circuit diagnostic code for the disconnected sensor is now Active.
OK ⇒ A SHORTED LOW diagnostic code was Active before
disconnecting the sensor.
An OPEN circuit
diagnostic code became Active after disconnecting the sensor. Temporarily reconnect the suspect sensor. If the sensor short circuit diagnostic code reappears, replace the sensor. Verify the diagnostic code is no longer Active with the new sensor installed.
Clear all Logged
diagnostic codes. STOP.
NOT OK ⇒ There is likely a short circuit between the Sensor Harness
Connector and the ECM.
Leave the sensor disconnected. Refer to P-501: Inspecting Electrical Connectors. If NOT OK, proceed to Step 6.
TEST STEP RESULT DIAGNOSIS/ACTION
This document has been printed from SPI². Not for Resale
5
4016-E61TRS Diagnostic Manual, May 2000 87
Step 4: Verify Supply Voltage Is Present At The Sensor
• Disconnect the suspect sensor.
• Fabricate a jumper wire (100 to 150 mm, 4 to 6 inches long) with Deutsch Pin Terminals on both ends.
• Monitor the Active Diagnostic Code Screen before and after installing the jumper wire (short circuit) between terminal-A (+8V) and terminal-B (Return) of the suspect sensor connector (engine harness side). Wait at least 10 seconds for the Sensor Supply SHORTED Low
diagnostic 41-04 code to become Active.
See Figure P-512.2.
The Sensor Supply SHORT circuit diagnostic 41-04 code should become Active when the jumper is installed.
OK ⇒ Supply voltage is present at the sensor. Remove the jumper. 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
This document has been printed from SPI². Not for Resale
5
88 4016-E61TRS Diagnostic Manual, May 2000
A
P512.2HD Connector view Deutsch HD Connectors (Terminal Side)
A
C B
Jack Plug
A B C
TEST STEP RESULT DIAGNOSIS/ACTION
Step 5: Create Short Circuit Between Signal And Return Terminals At The Sensor Connector
• Turn the Engine Control Switch to the STOP position.
• Fabricate a jumper wire (100 to 150 mm, 4 to 6 inches long) with Deutsch Pin Terminals on both ends. Install the jumper wire (short circuit) between terminal-C (Signal) and terminal-B (Return) of the suspect detonation sensor connector (engine harness side).
• Attempt to start the engine.
Note: If the engine starts, it will normally shut down within 10 seconds due to the Detonation Sensor diagnostic code.
If the engine will not start, crank the engine continuously for at least 10 seconds to allow the ECM to register Detonation Sensor Diagnostic codes.
• Access the Active Diagnostic Code Screen of the Electronic Service Tool. Check for Active Detonation Sensor SHORTED LOW 1501-04, 1505-04, 1509-04, 1513-04, 1502-04, 1506-04, 1510-04, 1514-04 diagnostic codes.
• Check for an Active 41-04 +8 VDC Sensor Supply Voltage Shorted Low diagnostic code.
See Figure P-512.2.
A Sensor SHORTED LOW diagnostic code should be Active with the jumper installed.
A 41-04 +8 VDC Sensor Supply Voltage Shorted Low diagnostic code should NOT be active.
OK ⇒ The engine harness and ECM check OK.
Thoroughly inspect the sensor connector. Refer to Inspecting Electrical Connectors. Reconnect the sensor. If the OPEN circuit diagnostic code reappears, replace the sensor. Clear all Logged diagnostic codes. STOP.
NOT OK ⇒ Most likely there is an OPEN circuit in either the Sensor Common or Sensor Signal wire in the Engine Harness between the ECM and the sensor.
Remove the jumper.
Refer to P-501:
Inspecting Electrical Connectors. If NOT OK, proceed to next step.
41-04 ACTIVE ⇒ A 41-04 diagnostic becomes active when the jumper is installed. There is likely a short circuit in the harness between the sensor signal and supply wires. Refer to P-501:
Inspecting Electrical Connectors. If NOT OK, proceed to next step.
This document has been printed from SPI². Not for Resale
5
4016-E61TRS Diagnostic Manual, May 2000 89
Step 6: Check ECM Operation By Creating Open And Short Circuits At ECM Connector
• Remove power from the engine control system. Turn the Engine Control Switch to the OFF position and remove the power connector on the Engine Mounted Panel.
• Disconnect ECM Engine Harness Connector J2/P2.
Thoroughly inspect both halves of the connector for signs of corrosion or moisture. Repair as necessary.
• Use a wire removal tool to remove the suspect detonation signal wire from P2.
• Restore power to the engine control system and attempt to start the engine. Crank the engine for a minimum of 10 seconds.
• Check the TIPPS Active Diagnostic Code Screen. An OPEN circuit diagnostic code should become Active for the disconnected detonation sensor input.
• Turn the Engine Control Switch to the OFF position.
• Insert a jumper wire with Deutsch Sockets on both ends between the suspect sensor input terminal of P2 (refer to diagram for signal terminals) and P1 terminal-19 (Unused Return).
• Attempt to start the engine. Crank the engine for a minimum of 10 seconds. A SHORTED LOW diagnostic code should become Active with the jumper wire installed.
See Figure P-512.3.
See Figure P-512.2.
OPEN circuit and SHORTED LOW diagnostic codes are Active as indicated by the test procedure.
OK ⇒ Either the OPEN circuit diagnostic code is NOT Active with the harness disconnected (open circuit), or the SHORTED LOW diagnostic code is NOT Active with the jumper wire (short circuit) installed. Repair or replace the Detonation Sensor harness as necessary. Refer to Inspecting Electrical Connectors. STOP.
NOT OK ⇒ Replace the ECM. STOP.
TEST STEP RESULT DIAGNOSIS/ACTION
This document has been printed from SPI². Not for Resale
5
90 4016-E61TRS Diagnostic Manual, May 2000
A
P512.3ECM Connector terminal locations
Wire Side Terminal Side
ECM Connector P2
58
+8 VDC Supply Return
Function Pin Location
This document has been printed from SPI². Not for Resale
5
4016-E61TRS Diagnostic Manual, May 2000 91