14753 Mercruiser CAP, VALVE

Table 1
J1939 Code and Description Comments
28-3
Accelerator Pedal Position 3 : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The ECM flags the throttle position as invalid data and a default value is used. The engine speed is limited to low idle.
The code is logged.
28-4
Accelerator Pedal Position 3 : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The ECM flags the throttle position as invalid data and a default value is used. The engine speed is limited to low idle.
The code is logged.
29-3
Accelerator Pedal Position 2 : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The ECM flags the throttle position as invalid data and a default value is used. The engine speed is limited to low idle.
The code is logged.
29-4
Accelerator Pedal Position 2 : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The ECM flags the throttle position as invalid data and a default value is used. The engine speed is limited to low idle.
The code is logged.
91-3
Accelerator Pedal Position 1 : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The ECM flags the throttle position as invalid data and a default value is used. The engine speed is limited to low idle.
The code is logged.
91-4
Accelerator Pedal Position 1 : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The ECM flags the throttle position as invalid data and a default value is used. The engine speed is limited to low idle.
The code is logged.
Table 2
Required Tools Qty
146-4080 Digital Multimeter Gp 1
7X-1710 Multimeter Probe 1
326-4904 Adapter Cable As 1
Table 3
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 28-3 code is active or logged.
Proceed to Test Step 4.
Result: A 28-4 code is active or logged.
Proceed to Test Step 5.
Result: A 29 or 91 code is active or logged.
Proceed to Test Step 2.
2. Check the Signal Frequency and the Duty Cycle at the Sensor
A. Turn the keyswitch to the OFF position.
B. Remove the wire from terminal location C (Throttle position) on the wiring harness side of the connector for the throttle position sensor.
C. Install a 326-4904 Adapter Cable As (3-PIN BREAKOUT) at the connector for the throttle position sensor.
D. Connect the connector for the throttle position sensor.
E. Turn the keyswitch to the ON position.
F. Measure the frequency and the duty cycle at the 326-4904 Adapter Cable As (3-PIN BREAKOUT) between the following terminals:
- B (Digital return) and C (Throttle position)
G. Operate the throttle pedal while making the measurements.
H. Turn the keyswitch to the OFF position.
J. Remove the breakout harness.
K. Restore the wiring harness connector to the original configuration.
Frequency
Duty cycle
Result: The Electronic Control Module (ECM) detects an incorrect frequency on the throttle signal or an incorrect duty cycle on the throttle signal. The frequency is below 150 Hz or the frequency is above 1000 Hz. The duty cycle is less than 5 percent or the duty cycle is greater than 95 percent.
Proceed to Test Step 3.
Result: The frequency and the duty cycle are within specifications for the entire range of the pedal.
Repair: Repair or replace the wiring harness.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Supply Voltage to the Sensor
A. Turn the keyswitch to the OFF position.
B. Disconnect the wiring harness connector for the throttle position sensor.
C. Measure the voltage across the following wiring harness connector terminals:
- Terminal A (8 V supply) and Terminal B (Digital return)
7.5 VDC
Result: The supply voltage is above 7.5 VDC at the sensor connector.
Repair: The wiring is OK. Replace the sensor.
Verify that the repair eliminated the problem.
Result: The supply voltage is not above 7.5 VDC at the sensor connector.
The supply voltage is not reaching the speed control.
Repair: Repair or replace the wiring harness.
Verify that the repair eliminated the problem.
4. Create a Short at the Throttle Connector
A. Turn the keyswitch to the OFF position.
B. Install a jumper wire between the appropriate signal and return wire at the sensor connector to create a short.
- Signal terminal and Return terminal
C. Connect Cat ET.
D. Use Cat ET to monitor the following codes:
- -4 code
E. Turn the keyswitch to the OFF position.
Create a Short
Result: A -4 or -6 code becomes active.
Repair: The wiring is OK. Replace the failed throttle.
Verify that the repair eliminated the problem.
Result: A -4 or -6 code does not become active.
Proceed to Test Step 5.
5. Create an Open at the Throttle Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the appropriate throttle sensor connector.
C. Connect Cat ET.
D. Use Cat ET to monitor the following codes:
- -3 code
E. Turn the keyswitch to the OFF position.
Create an Open
Result: A -3 or -5 code becomes active.
Repair: The wiring is OK. Replace the failed throttle.
Verify that the repair eliminated the problem.
Result: A -3 or -5 code does not become active.
Proceed to Test Step 6.
6. Check the Supply Voltage to the Sensor
A. Turn the keyswitch to the OFF position.
B. Disconnect the wiring harness connector for the throttle position sensor.
C. Turn the keyswitch to the ON position.
D. Measure the voltage across the appropriate connector terminals.
Note: Refer to the correct wiring schematic for sensor supply information. It may differ from engine to engine.
E. Connect the sensor.
5 VDC
Result: The supply voltage is correct.
Proceed to Test Step 7.
Result: The supply voltage is not correct.
Repair: There is a short in the harness. Repair or replace the wiring harness.
Verify that the repair eliminated the problem.
7. Perform the Wiggle Test
Carefully following this procedure is the best way to identify the root cause of an intermittent problem.
A. Connect Cat ET.
B. Use CAT ET to perform the following test:
- "Wiggle Test"
C. Slowly wiggle the wiring and the connectors between the P2 connector and the sensor. Slowly wiggle the wiring and the connectors between the P1 connector and the sensor. Pay particular attention to the