+8VDC
Return Detonation Input A Detonation Input B Detonation Input C Detonation Input D
+8V
Return Cylinder 1 & 2 Cylinder 3 & 4 Cylinder 5 & 6 Cylinder 7 & 8 56 Detonation Input E Detonation Input F Detonation Input G Detonation Input H
+8V
Return Cylinder 1 & 2
Cylinder 3 & 4 Cylinder 5 & 6 Cylinder 7 & 8 57 Inlet Manifold Pressure Return
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4016-E61TRS Diagnostic Manual, May 2000 121
A
P522.2ECM Connector terminal locations
ECM Connector P1 ECM Connector P2
Return Return +8 VDC Supply +8 VDC Supply
54 55 56 57
Function Pin Location
+8 VDC Supply Return
4 5
Function Pin Location
Wire Side
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122 4016-E61TRS Diagnostic Manual, May 2000
Diagnostic codes
CID-FMI Conditions which generate this code: Systems Response: Troubleshooting 41-03 +8 VDC Power Supply Shorted High
The ECM supply voltage for the Detonation Sensors and Inlet Manifold Pressure Sensor is exceeding normal level, indicating a possible short to a positive voltage source.
Electronic System Response - All ECM 8 VDC analogue sensor inputs assume default values and all diagnostic codes for ECM 8 VDC analogue sensors are disabled while this Diagnostic Code is Active.
TIPPS may indicate DIAG next to the default value sensor Status to indicate the sensor is operating at the value shown due to an Active diagnostic code.
* Since engine protection is no longer available, the engine is shut down.
Proceed with P-522: +8V Sensor Voltage Supply Circuit Test
41-04 +8 VDC Power Supply Shorted Low The ECM supply voltage for the Detonation Sensors and Inlet Manifold Pressure Sensor is below normal level, indicating a possible short to ground.
Electronic System Response - All ECM 8 VDC analogue sensor inputs assume default values and all diagnostic codes for ECM 8 VDC analogue sensors are disabled while this Diagnostic Code is Active.
TIPPS may indicate DIAG next to the default value sensor Status to indicate the sensor is operating at the value shown due to an Active diagnostic code.
* Since engine protection is no longer available, the engine is shut down.
Proceed with P-522: +8V Sensor Voltage Supply Circuit Test
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4016-E61TRS Diagnostic Manual, May 2000 123
Functional test
TEST STEP RESULT DIAGNOSIS/ACTION
Step 1: Connect An Electronic Service Tool And Note All Active Diagnostic codes
• Connect TIPPS to the Service Tool Link Connector.
• Turn the Engine Control Switch to the STOP position.
• Access the TIPPS Active and Logged Diagnostic Code screen(s) (wait at least 15 seconds for Diagnostic codes to become Active).
• Check for Active or Logged 41-03 +8 Volt Supply Above Normal, or 41-04 +8 Volt Supply Below Normal diagnostic code.
Select the condition of code 41-03 or 41-04.
ACTIVE ⇒ A 41-03 or 41-04 diagnostic code is ACTIVE. Proceed to next step.
LOGGED ONLY
⇒ A 41-03 or 41-04 diagnostic code is LOGGED but NOT active. Refer to P-501:
Inspecting Electrical Connectors. If OK, proceed to Step 5.
NOT ACTIVE OR LOGGED
⇒ The +8 Volt Sensor Supply is operating correctly at this time.
STOP.
Step 2: Disconnect +8V Sensors And Monitor Active Diagnostic codes
• Access the Active Diagnostic Code Screen and verify there is an ACTIVE +8V Sensor Supply Diagnostic Code (41-03 or 41-04).
• Disconnect the following sensors and turn the Engine Control Switch to the OFF position, then to the STOP position: Inlet Manifold Pressure and all Detonation Sensors. Check the TIPPS screen after disconnecting each sensor to determine if disconnection of a specific sensor deactivates the +8V Diagnostic Code.
Note: When the sensors are disconnected and the Engine Control Switch is in the STOP position, Open Circuit diagnostic codes will be Active/Logged when the +8V diagnostic codes are no longer Active. This is normal. Clear these diagnostic codes after this test step is completed.
Is the original +8V Diagnostic Code (41-03 or 41-04) still Active?
YES ⇒ The +8V Diagnostic Code is still Active. Leave the sensors disconnected.
Proceed to next step.
NO ⇒ Disconnecting a specific sensor makes the +8V Diagnostic Code no longer Active. Reconnect the sensor suspected of causing the problem. If the problem reappears, and then disappears following disconnection, replace the sensor. Clear all diagnostic codes.
Verify the repair eliminates the problem.
STOP.
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Step 3: Isolate The Sensor Supply Harness From The ECM At J2/P2
• Remove power from the engine control system. Turn the Engine Control Switch to the OFF position and
disconnect the battery.
• Disconnect J2/P2.
• Inspect for damage or corrosion. Repair as necessary.
• Reconnect J2/P2.
• Use a wire removal tool to remove the +8 VDC supply wires from P2 (terminal-56, terminal-57)
• Restore power to the engine control system and turn the Engine Control Switch to the STOP position.
• Access the Active Diagnostic Code Screen and determine there is an ACTIVE +8V Sensor Supply Diagnostic Code (41-03 or 41-04).
Does the +8V Diagnostic Code remain Active with the Engine Harness isolated?
YES ⇒ Proceed to next step.
NO ⇒ The +8V Diagnostic Code is no longer Active when the harness is isolated.
There is a short circuit in the P2 harness. Refer to P-501: Inspecting Electrical Connectors.
If OK, proceed to Step 5.
Step 4: Isolate The Sensor Supply Harness From The ECM At J1/P1
• Remove power from the engine control system. Turn the Engine Control Switch to the OFF position and
disconnect the battery.
• Disconnect J1/P1.
• Inspect for damage or corrosion. Repair as necessary.
• Reconnect J1/P1.
• Use a wire removal tool to remove the +8 VDC supply wires from P1 terminal-4.
• Restore power to the engine control system and turn the Engine Control Switch to the STOP position.
• Access the Active Diagnostic Code Screen and determine there is an ACTIVE +8V Sensor Supply Diagnostic Code (41-03 or 41-04).
Does the +8V Diagnostic Code remain Active with the Engine Harness isolated?
YES ⇒ Isolating the Engine Harness from the ECM does not eliminate the Active +8V Sensor Diagnostic Code.
Temporarily connect a test ECM with the 70-Pin Breakout-T installed between J1 and P1.
Recheck for an Active +8V Diagnostic codes. If the problem is resolved with the test ECM, install the old ECM to verify the problem returns. If the test ECM works and the old one does not, replace the ECM. STOP.
NO ⇒ The +8V Diagnostic Code is no longer Active when the harness is isolated.
There is a short circuit in the P1 harness. Refer to P-501: Inspecting Electrical Connectors.
If OK, proceed to next step.
TEST STEP RESULT DIAGNOSIS/ACTION
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4016-E61TRS Diagnostic Manual, May 2000 125
Step 5: Check The Engine Harness
• Remove power from the engine control system. Turn the Engine Control Switch to the OFF position and
disconnect the battery.
• Disconnect J1/P1, J2/P2 and verify ALL of the +8V engine sensors (Inlet Manifold Pressure Sensor and the (8) Detonation Sensors) are disconnected.
• Set a multimeter to measure resistance on the range closest to, but not less than, 2k Ohms. Measure from P1 terminal-4 (+8VDC Supply) to P1 terminals 5 (Return), and 10 (Inlet Manifold Pressure). Wiggle the harness during measurement to reveal any intermittent short condition.
• Measure from P1 terminal-4 (+8VDC Supply) to +Battery, -Battery, and engine ground.
• Measure from P2 terminal-56 (+8VDC Supply) to each of the following sensor signal terminals (P2 terminals-36, 37, 38, 39, 44, 45, 46, 47, 55). Wiggle the harness during measurement to reveal any intermittent short condition.
• Measure from P2 terminal-56 (+8VDC Supply) to +Battery, -Battery, and engine ground.
• Measure from P2 terminal-57 (+8VDC Supply) to each of the following sensor signal terminals (P2 terminals-36, 37, 38, 39, 44, 45, 46, 47, 55). Wiggle the harness during measurement to reveal any intermittent short condition.
• Measure from P2 terminal-57 (+8VDC Supply) to +Battery, -Battery, and engine ground.
See Figure P-522.2.
Each resistance measurement is more than 2k Ohms.
OK ⇒ The +8V line is not shorted in the Engine Harness. Reconnect all connectors. There does not appear to be a problem at this time.
Clear all diagnostic codes. Continue to troubleshoot until the original condition is resolved. STOP.
NOT OK ⇒ Repair or replace the Engine Harness. Clear all logged diagnostic codes.
Verify the repair eliminates the problem.
STOP.
TEST STEP RESULT DIAGNOSIS/ACTION
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