21492847 Volvo.Penta Relay bracket

Table 1
Diagnostic Codes
CDL Code Code Description Comments
110-3 Engine Coolant Temperature Sensor : Voltage Above Normal The Electronic Control Module (ECM) detects a signal voltage that is not in the acceptable range. The code is logged.
The -3 code will become active after the engine has been running for more than seven minutes. The ECM uses the last valid engine coolant temperature. If the diagnostic code is active at start-up, the ECM will use intake manifold temperature. If intake manifold air temperature is not valid, the ECM will default to 90 °C (194 °F) for engine coolant temperature. The ECM will activate the cooling fan after this code has been active for more than eight seconds.
110-4 Engine Coolant Temperature Sensor : Voltage Below Normal The ECM detects a signal voltage that is not in the acceptable range. The code is logged.
The ECM uses the last valid engine coolant temperature. If the diagnostic code is active at start-up, the ECM will use intake manifold temperature. If intake manifold air temperature is not valid, the ECM will default to 90 °C (194 °F) for engine coolant temperature. The ECM will activate the cooling fan after this code has been active for more than eight seconds.
172-3 Intake Manifold Air Temperature Sensor : Voltage Above Normal The ECM detects a signal voltage that is not in the acceptable range. The code is logged.
The ECM flags the intake manifold air temperature as invalid data and the intake manifold air temperature is set to a default value of 40 °C (104 °F).
172-4 Intake Manifold Air Temperature Sensor : Voltage Below Normal The ECM detects a signal voltage that is not in the acceptable range.
174-3
Fuel Temperature Sensor : Voltage Above Normal The ECM detects a signal voltage that is not in the acceptable range. The code is logged.
The ECM flags the fuel temperature as invalid data and the fuel temperature is set to a default value of 40 °C (104 °F).
174-4 Fuel Temperature Sensor : Voltage Below Normal The ECM detects a signal voltage that is not in the acceptable range.
1796-3 Intake Manifold #2 Air Temperature Sensor : Voltage Above Normal The ECM detects a signal voltage that is not in the acceptable range. The code is logged.
The ECM flags the intake manifold temperature as invalid data and the intake manifold temperature is set to a default value.
1796-4 Intake Manifold #2 Air Temperature Sensor : Voltage Below Normal The ECM detects a signal voltage that is not in the acceptable range.
2526-3 Air Inlet Temperature Sensor : Voltage Above Normal The ECM detects a signal voltage that is not in the acceptable range. The code is logged.
2526-4 Air Inlet Temperature Sensor : Voltage Below Normal The ECM detects a signal voltage that is not in the acceptable range. The code is logged.
3386-3 EGR Temperature Sensor : Voltage Above Normal The ECM detects a signal voltage that is not in the acceptable range. The code is logged.
3386-4 EGR Temperature Sensor : Voltage Below Normal The ECM detects a signal voltage that is not in the acceptable range. The code is logged. System OverviewThe sensor signal for the passive sensor is routed from the ECM to terminal 1 of each sensor connector. The sensor return for the passive sensors is routed from the ECM to terminal 2 of each sensor connector.Diagnostics on the Caterpillar Electronic Technician (ET)Wiggle Test - The Wiggle Test allows you to monitor the status of the signals from the sensors.For additional information regarding the Wiggle Test, refer to the documentation that accompanies the Cat ET software.
Illustration 1 g02133854
Schematic for the passive sensors
Illustration 2 g01684375
Terminal locations at the P1 ECM connector for the passive sensors
(P1-3) Analog return
(P1-17) Air inlet temperature
Illustration 3 g02134161
Terminal locations at the P2 ECM connector for the passive sensors
(P2-17) Analog return
(P2-30) Analog return
(P2-56) Intake manifold air temperature (right side)
(P2-62) NRS temperature
(P2-83) Analog return
(P2-84) Engine coolant temperature
(P2-95) Intake manifold air temperature (left side)
(P2-96) Fuel temperature
Illustration 4 g01155187
Terminal locations at the connector for the passive analog sensors
(Terminal 1) Sensor signal
(Terminal 2) Analog return Test Step 1. Check for Diagnostic Codes
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Start the engine.
Access the "Active Diagnostic Code" screen on Cat ET. Note: The engine must be running for seven minutes in order for a 110-3 code to become active.
Look for these active codes or logged codes:
-3
-4Results:
Logged Code - A diagnostic code is logged. Proceed to Test Step 4.
Active -3 - A -3 diagnostic code is active. Proceed to Test Step 2.
Active -4 - A -4 diagnostic code is active. Proceed to Test Step 3.Test Step 2. Create a Short at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the suspect sensor.
Install the jumper wire between terminal 1 (sensor signal) and terminal 2 (sensor return) at the sensor connector.
Turn the keyswitch to the ON position.
Monitor the diagnostic codes on Cat ET. Check for an active -4 diagnostic code for the suspect sensor. Note: The engine must be running for seven minutes in order for a 110-3 code to become active.
Turn the keyswitch to the OFF position. Results:
Active -3 - The -3 diagnostic code remains active for the suspect sensor.Repair: There is an open in the harness. Repair the wiring or replace the harness.Verify that the problem is resolved.STOP
Active -4 - A -4 diagnostic code became active after creating the short at the sensor connector.Repair: The wiring is OK. Replace the sensor.Verify that the problem is resolved.STOPTest Step 3. Create an Open at the Suspect Sensor Connector
Turn the keyswitch