17390-ZW9-000 Honda COVER, MUFFLER (Honda Code 6639744).

If a fault occurs with the primary throttle with secondary throttle is installed, the secondary throttle will be used until the fault is repaired.If a fault occurs with the secondary throttle, the engine will use the primary throttle until the fault is repaired.If a functional throttle is not available, the following conditions will occur:
The engine will default to the limp home speed.
If the engine speed is higher than the limp home speed, the engine will decelerate to the limp home speed.
If the engine speed is lower than the limp home speed, the engine speed will remain at the current speed.
The engine will remain at this speed when the diagnostic code remains active.
All inputs from the faulty throttle are ignored by the ECM until the fault is repaired.
All inputs from the repaired throttle will be ignored by the ECM until the keyswitch has been cycled.The diagnostic codes above relate to an analog sensor. Use this procedure only if the analog sensor uses an output from a variable resistor.The sensor is most likely to be mounted on a throttle pedal. The sensor is attached directly to the throttle assembly. The sensor provides an output voltage to the ECM. The sensor output voltage will vary with the position of the throttle. Foot operated or hand operated throttle assemblies are available.The sensor receives +5 VDC power from the ECM. The sensor will produce a raw signal voltage that will alter between low idle and high idle. The voltage is changed into a throttle position within the range 0% to 100% by the ECM.The sensor senses the speed requirement from the throttle position. A second sensor may override this speed requirement from the first sensor. This override will be subject to an input from a secondary throttle or from the SAE J1939 (CAN) data link.Use the electronic service tool to check the input status.Note: The identification letters for the terminals in the connectors may vary dependent on the manufacturer of the throttle pedal. Substitute the correct letters/numbers as required.
Illustration 1 g06013372
Schematic of the analog throttle position sensors
Illustration 2 g06036267
P1 and P2 harness connector pin locations for the analog throttle position sensors
(J1:23) Throttle 1 - 5 VDC supply
(J1:24) Throttle 1 - position
(J1:25) Throttle 1 - ground
(J2:21) Throttle 2 - 5 VDC supply
(J2:32) Throttle 2 - position
(J2:58) Throttle 2 - ground
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P1/J1 and P2/J2 ECM connectors and the analog throttle position sensors.
Refer to Troubleshooting, "Electrical Connector - Inspect".
B. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the active diagnostic code.
C. Perform a 45 N (10 lb) pull test on each of the wires in the analog throttle position sensor connectors that are associated with the active diagnostic code.
D. Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
E. Check the harness for corrosion, abrasion, and pinch points from the analog throttle position sensors to the ECM.
Loose connection or damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wiring harness. Ensure that all the seals are properly in place and ensure that the connectors are correctly coupled.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points.
Proceed to Test Step 2.
2. Check for Active Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position. Wait at least 10 seconds for activation of the diagnostic codes.
D. Verify if any of the diagnostic codes that are listed in Table 1 are active.
E. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: There are no active diagnostic codes for the analog throttle position sensors.
Proceed to Test Step 3.
Result: One or more of the diagnostic codes listed in Table 1 is active.
Proceed to Test Step 5.
3. Check the Throttle Position with the Electronic Service Tool
A. Connect the electronic service tool to the diagnostic connector.
B. Turn the keyswitch to the ON position. Do not start the engine.
C. Observe the throttle position reading on the electronic service tool.
D. Operate the throttle over the full range of movement.
Percentage of throttle range at low idle.
Percentage of throttle range at high idle
The percentages depend on the programmed throttle ranges.
Result: Not OK - The ECM is not receiving the correct signal from the sensor.
Repair: Use the electronic service tool to verify that the throttle has been configured correctly before continuing with this procedure. For information on the parameters that can be configured, refer to Troubleshooting, "Throttle Setup".
If the fault is still present after the throttle has been configured correctly, replace the analog throttle position sensor.
Result: OK - The sensor is operating correctly.
Proceed to Test Step 4.
4. Check the Throttle Selection Status with the Electronic Service Tool
A. Check the status of the throttle selection switch (if equipped). Use the electronic service tool to check the status of the throttle selection switch.
Throttle 1 has control when status is "OFF".
Throttle 2 has control when status is ON.
Result: OK - The throttle section switch is operating correctly.
Return the engine to service.
If an intermittent fault exists, refer to Troubleshooting, "Electrical Connector - Inspect"
Result: Not OK - The wrong throttle is selected.
Repair: Switch to the other throttle. There may be a fault with the selector switch input.
Check the connections between the throttle selection switch and the ECM connector. Refer to Troubleshooting, "Electrical Connector - Inspect".
5. Check the Sensor Supply Voltage
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect throttle position sensor.
C. Turn the keyswitch to the ON position.
D. Measure the voltage between the 5 VDC terminal and the ground terminal on the harness connector for the sensor.
4.84 VDC to 5.16 VDC