14721-ZV0-000 Honda VALVE, EX. (Honda Code 1814300).

Table 1
Diagnostic Codes Table    
Code    Conditions which Generate this Code    System Response    
110-3 Engine Coolant Temperature Sensor : Voltage Above Normal     The engine's ECM detects signal voltage that is above normal.     The code is logged. The ECM will flag the engine coolant temperature as invalid data and the engine coolant temperature is set to a default value.    
110-4 Engine Coolant Temperature Sensor : Voltage Below Normal     The engine's ECM detects signal voltage that is below normal.    
172-3 Intake Manifold Air Temperature Sensor : Voltage Above Normal     The engine's ECM detects signal voltage that is above normal.     The ECM will log the diagnostic code. The ECM will flag the intake manifold air temperature as invalid data and the intake manifold air temperature is set to a default value.    
172-4 Intake Manifold Air Temperature Sensor : Voltage Below Normal     The engine's ECM detects signal voltage that is below normal.    
174-3 Fuel Temperature Sensor : Voltage Above Normal     The engine's ECM detects signal voltage that is above normal.     The code is logged. The ECM will flag the fuel temperature as invalid data and the fuel temperature is set to a default value.    
174-4 Fuel Temperature Sensor : Voltage Below Normal     The engine's ECM detects signal voltage that is below normal.    System OperationUse this procedure to troubleshoot any suspect problems with the following sensors:
Coolant temperature sensor
Fuel temperature sensor
Intake manifold air temperature sensorThe 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.
Illustration 1 g01825713
Typical schematic
Illustration 2 g01748276
P2 ECM connector (P2-13) Engine coolant temperature (P2-30) Sensor return (P2-56) Intake manifold air temperature (P2-62) Fuel temperature
Illustration 3 g01155187
Connector for the temperature sensors (1) Sensor signal (2) Sensor return
Illustration 4 g01825735
Sensor locations (typical left side engine view) (1) Intake manifold air temperature sensor (2) Control box (3) J1/P1 ECM connector (4) Primary ECM (5) Alternate ECM (6) J2/P2 ECM connectors (7) Fuel temperature sensor
Illustration 5 g01825753
Front engine view (typical example) (8) Engine coolant temperature sensorTest Step 1. Check for "Active" or "Logged" Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the diagnostic codes on Cat ET. Check and record any diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Determine if a diagnostic code has occurred several times.Note: A diagnostic code that is logged several times is an indication of an intermittent problem. Most intermittent problems are the result of a poor connection between a socket and a pin in a connector or of a poor connection between a wire and a terminal.
Determine if the problem is active and related to one of the following diagnostic codes:
-3
-4Expected Result:A diagnostic code is not active.Results:
OK - A diagnostic code is not active.Repair: The problem may be intermittent. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - An active -3 diagnostic code is present. Proceed to Test Step 2.
Not OK - An active -4 diagnostic code is present. Proceed to Test Step 4.Test Step 2. Check for Battery Voltage on the Signal Wire
Measure the voltage on the harness side of the sensor connector between pin 1 and engine ground for the suspect sensor(s).Expected Result:The signal voltage is less than battery voltage.Results:
OK - The signal voltage is less than battery voltage. Proceed to Test Step 3.
Not OK - The signal voltage is equal to battery voltage.Repair: There is a short in the harness to the Battery. Repair the wiring.STOPTest Step 3. Create a Short at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the suspect sensor.
Use a wire jumper in order to create a short between terminal 1 (signal) and terminal 2 (sensor return) at the sensor connector.
Turn the keyswitch to the ON position.
Access the "Active Diagnostic Code" screen on Cat ET. Check for an active -4 diagnostic code for the suspect sensor.
Turn the keyswitch to the OFF position.Expected Result:A -4 diagnostic code is now active for the suspect sensor(s).Results:
OK - A -3 diagnostic code was active before creating the short at the sensor connector. A -4 diagnostic code became active after creating the short at the sensor connector. The wiring between the ECM and the sensor connector is OK.Repair: Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine. Verify that there are no active diagnostic codes for the sensor. If there are no active diagnostic codes for the sensor, permanently install the new sensor. Clear any logged diagnostic codes.STOP
Not OK - A -3 diagnostic code is still active for the suspect sensor(s). There is an open circuit between the sensor connector and the ECM. Leave the sensor disconnected. Proceed to Test Step 5.Test Step 4. Create an Open at the Suspect Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the sensor connector of the suspect sensor(s) with the active -4 diagnostic code.
Turn the keyswitch to the ON position. Wait at least 30 seconds for activation of the diagnostic codes.
Access the "Active Diagnostic Code" screen on Cat ET. Check for an active -3 diagnostic code.
Turn the keyswitch to the OFF position.Expected Result:A -3 diagnostic code is now active for the suspect sensor(s).