818064 Volvo.Penta Washer

Table 1
J1939 Code and Description Comments
1392-3
Engine Air to Fuel Differential Pressure : Voltage Above Normal An open circuit has been detected.
The code is logged.
1392-4
Engine Air to Fuel Differential Pressure : Voltage Below Normal A short circuit has been detected.
The code is logged.
1392-8
Engine Air to Fuel Differential Pressure : Abnormal Frequency, Pulse Width, or Period The frequency of the pressure sensor is outside the range of the sensor.
The code is logged.
4817-3
Engine Intake Manifold #1 Absolute Pressure : Voltage Above Normal An open circuit has been detected.
The code is logged.
4817-4
Engine Intake Manifold #1 Absolute Pressure : Voltage Below Normal A short circuit has been detected.
The code is logged.
4817-8
Engine Intake Manifold #1 Absolute Pressure : Abnormal Frequency, Pulse Width, or Period The frequency of the pressure sensor is outside the range of the sensor.
The code is logged. Tubes that connect the air/fuel pressure module to the inlet air manifold and to the fuel manifold enable the module to sense the absolute inlet manifold air pressure and fuel pressure. The module calculates the differential pressure between the fuel manifold and the inlet air manifold. This fuel differential pressure is the value of the fuel pressure minus the value of the inlet manifold air pressure.Pulse Width Modulation (PWM) - This is a digital signal. The frequency is constant: the percent on time versus the period is called a duty cycle. If the signal is on for 50 percent of the period as an example, the duty cycle is 50 percent. This provides a more accurate status for a parameter than a signal that can only be ON or OFF.The air/fuel pressure module sends PWM signals that represent the inlet manifold air pressure and the fuel differential pressure to the Electronic Control Module (ECM). The ECM uses the information to help calculate the fuel flow.
Illustration 1 g03788049
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: A -3 code is active or logged.
Proceed to Test Step 2.
Result: A -4 code is active or logged.
Proceed to Test Step 3.
Result: A -8 code is active or logged.
Proceed to Test Step 5.
2. Create a Short at the Sensor Connector
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the sensor with the active -3 code.
C. Install the jumper wire between the following terminals at the air/fuel pressure module wiring harness connector:
- Affected sensor signal terminal and Terminal B (sensor return)
D. Connect Cat ET.
E. Use Cat ET to monitor the following:
- -4 code
F. Turn the main disconnect switch to the OFF position.
Create a Short
Result: A -4 code became active.
Repair: The wiring harness is OK. Replace the sensor.
Verify that the repair eliminated the problem.
Result: A -4 code did not become active.
Proceed to Test Step 4.
3. Create an Open at the Sensor Connector
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the air/fuel pressure module.
C. Connect Cat ET.
D. Use Cat ET to monitor the following:
- -3 code
F. Turn the main disconnect switch to the OFF position.
Create an Open
Result: A -3 code became active.
Repair: The wiring harness is OK. Replace the air/fuel pressure module.
Verify that the repair eliminated the problem.
Result: A -3 code did not become active.
Proceed to Test Step 4.
4. Check the 24 VDC Supply Voltage at the Sensor Connector
A. Turn the main disconnect switch to the ON position.
B. Measure the voltage at the following terminal locations at the air/fuel pressure module connector:
- Terminal A and Terminal B
C. Reconnect the air/fuel pressure module.
Supply Voltage
Result: The supply voltage is approximately battery voltage.
Proceed to Test Step 8.
Result: The supply voltage is not approximately battery voltage.
Repair: There is a short in the wiring harness to the battery. Repair or replace the wiring harness.
If the problem is not resolved, proceed to Test Step 5.
5. Check the PWM Circuit for an Open
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the air/fuel pressure module.
C. Disconnect the J1 connector at the ECM.
D. Measure the resistance between the following terminal locations for the air/fuel pressure module:
- The signal wire at the affected sensor terminal and the appropriate PWM signal wire on the ECM connector
Open Circuit
Result: Less than 10 ohms of resistance between the sensor connector and the ECM connector.
Proceed to Test Step 6.
Result: More than 10 ohms of resistance between the sensor connector and the ECM connector.
There is an open circuit in the wiring harness. Repair or replace the wiring harness.
If the problem is not resolved, proceed to Test Step 6.
6. Check the PWM Circuit for a Short Circuit
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the air/fuel pressure module.
C. Disconnect the J1 connector at the ECM.
D. Measure the resistance between the following locations for the sensor:
- The signal wire at the affected sensor terminal and Engine ground
Short Circuit
Result: There was more than 100 K ohms of resistance between The signal wire at the affected sensor terminal and engine ground.
Proceed to Test Step 7.
Result: There was less than 100 K ohms of resistance between The signal wire at the affected sensor terminal and engine ground.
There is a short circuit in the wiring harness. Repair or replace the wiring harness.
If the problem is not resolved, proceed to Test Step 7.
7. Check the PWM Circuit for a Pin to Pin Short Circuit
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the air/fuel pressure module.
C. Disconnect the J1 connector at the ECM.
D. Measure the resistance between the following locations for the sensor:
- The signal wire at the affected sensor and all ECM connector pins
Short Circuit
Result: There was more than 100 K ohms of resistance between the signal pin at the ECM and all other pins in the ECM connector.
Proceed to Test Step 8.
Result: There was less than 100 K ohms of resistance between the signal pin at the ECM and all other pins in the ECM connector.
There is a short circuit in the wiring harness. Repair or replace the wiring harness
If the problem is not resolved, proceed to Test Step 8.
8. Perform the Wiggle Test
Carefully