21669409 Volvo.Penta Wiring harness

Table 1
J1939 Code and Description CDL Code and Description Comments
6647-12
Gaseous Fuel High Pressure Shutoff Valve : Failure 4777-12
Engine Fuel #2 High Pressure Shutoff Valve : Failure Fuel rail pressure is above the intake manifold air pressure.
The gas shutoff valve has failed open.
Replace the gas shutoff valve.
6886-12
Engine Gaseous Fuel Supply Pressure Regulator : Failure 6041-12
Engine Gaseous Fuel Supply Pressure Regulator : Failure The gas pressure regulator has failed closed.
Repair or replace the gas pressure regulator.
7021-10
Engine Fuel #2 Injector Metering Rail #1 Pressure : Abnormal Rate of Change E1467 (1)
Fuel Rail #2 Pressure Not Responding Fuel rail pressure has been detected as abnormal.
Gas blending will not be enabled until the condition is resolved.
7021-15
Engine Fuel #2 Injector Metering Rail #1 Pressure : High - least severe (1) E1640 (1)
High Engine Fuel #2 Injector Metering Rail Pressure Fuel rail pressure has been detected at pressures greater than system requirements.
7021-16
Engine Fuel #2 Injector Metering Rail #1 Pressure : High - moderate severity (2) E1640 (2)
High Engine Fuel #2 Injector Metering Rail Pressure Fuel rail pressure has been detected at pressures greater than system requirements.
7021-18
Engine Fuel #2 Injector Metering Rail #1 Pressure : Low - moderate severity (2) E1639 (2)
Low Engine Fuel #2 Injector Metering Rail Pressure Fuel rail pressure has fallen below the minimum required pressure threshold.
Table 2
Associated Codes
J1939 CDL Troubleshooting Procedure
6646-16 E221 (2) Troubleshooting, "Fuel Pressure Is High (Gas Supply)"
6646-18 E222 (2) Troubleshooting, "Fuel Pressure Is Low (Gas Supply)" Electrical Checkouts on the Cat® Electronic Technician (ET)
Table 3
Component Electrical Checkout
Gas Shutoff Valve Engine Fuel Shutoff Valve #1 Control Override(1)
(1) The gas supply pressure must be 150 kPa (22 psi) or less to allow activation of the override.Gas rail pressure is constantly being monitored by the engine monitoring system. Prior to enabling gas blending, the system will initiate a system health check on the integrity of the gas fuel rail and associated components. During this time, the Gas Shutoff Valve (GSOV) is cycled ON then OFF to provide gas pressure to the rail. Observation in the rise and fall of system pressure is measured at this time. If conditions are detected which indicate there is a problem with the integrity of the gas fuel train, a 7021-10 Engine Fuel #2 Injector Metering Rail #1 Pressure : Abnormal Rate of Change is activated.Probable Causes
Codes
Supply pressure
Pressure regulatorRecommended Actions
Table 4
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A -10 or -18 code is active or logged.
Proceed to Test Step 2.
Result: A -15 or -16 code is active or logged.
Proceed to Test Step 3.
2. Check the Gas Pressure
A. Turn the keyswitch to the OFF position.
B. Close the isolation valve.
C. Utilize chassis vent valve and safely purge gas from the gas supply line.
Note: It is not recommended to use compressed air which may introduce moisture into the gas supply system.
D. Connect Cat ET.
E. Use Cat ET to perform the following override:
- Engine Fuel Shutoff Valve #1 Control override
F. Use Cat ET to monitor the status of the "Gas Supply Pressure" and "Gas Rail Pressure".
Note: The pressure values should be equal.
Supply Pressure
Result: The gas supply pressure equal to the gas rail pressure. The GSOV is operating properly.
Proceed to Test Step 3.
Result: The gas supply pressure did not equal to the gas rail pressure and remained at 0 +/- 0.2 PSI.
Repair: The GSOV is not opening properly. Repair or replace the GSOV.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Gas Pressure Regulator
A. Connect Cat ET.
B. Use Cat ET to perform the following override:
- Engine Fuel Shutoff Valve #1 Control override
C. Use Cat ET to monitor the status of the "Gas Rail Pressure".
Pressure Regulator
Result: The gas rail pressure is observed as higher or lower than specification.
Repair: Adjust the gas pressure regulator. Refer to Testing and Adjusting, Fuel Pressure - Test (Gas System) for additional information. After adjusting the gas pressure regulator, the gas rail pressure now is within specification.
The gas rail pressure is not within specifications after adjusting the gas pressure regulator. Repair or replace the gas pressure regulator.
Verify that the repair eliminated the problem.
Result: The gas rail pressure is within specification. A leak in the gas fuel train after the regulator has been detected by the "Rail Integrity Check" function.
Repair: Repair or replace damaged gas fuel train components.
Verify that the repair eliminated the problem.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).