Honda Pilot: Fuel Pressure Test

Honda Pilot 2016-2022 (YF5/YF6) Service Manual / Parts Test Info / Fuel Pressure Test

Test

1. Fuel Pressure - Relieve

2. Fuel Pressure - Test

Honda Pilot. Parts Test Info

NOTE: If you were referred to this procedure from a troubleshooting procedure, test the fuel pressure under the same conditions the malfunction occurred (engine speed, load, throttle position, etc.).

Disconnect the quick-connect fitting and attach the fuel pressure gauge set. Check for leaks with the gauge set attached.
Start the engine, and let it idle.

If the engine starts, go to step 3 and read the fuel pressure gauge.
If the pump does not run and any DTCs are stored, do the DTC troubleshooting.
If the pump does not run and no DTCs are stored, do the fuel pump circuit troubleshooting.

Read the fuel pressure gauge. The pressure should be: 410－460 kPa (4.18－4.69 kgf/cm2, 59.5－66.7 psi)

If the pressure is OK, the test is complete.
If the pressure is out of specification, replace the fuel pressure regulator and the fuel filter, then recheck the fuel pressure.

Gauge Control Module Input Test

NOTE:

Before testing, do the gauge control module self-diagnostic function, and make sure the B-CAN communication lines are OK.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
Before testing, make sure the No. A26 (10 A) fuse in the under-hood fuse/relay box is OK.
With auto idle stop system: Before testing, make sure the No. D1 (7.5 A) fuse in the auxiliary under-dash fuse/relay box is OK.
Without auto idle stop system: Before testing, make sure the No. C29 (7.5 A) fuse in the under-dash fuse/relay box is OK.

1. Turn the vehicle to the OFF (LOCK) mode.

2. Disconnect the gauge control module 32P connector.

Honda Pilot. Parts Test Info

3. Inspect the connector and socket terminals to be sure they are all making good contact:

If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
If the terminals are OK, go to step 4.

4. With the connector still disconnected, do the following input tests:

If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, go to step 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
15	RED	Combination light switch ON	Connect to ground with a jumper wire: The dashlights should come on full bright.	Faulty LEDs An open or high resistance in the wire
16	BLU	Combination light switch ON	Connect to ground with a jumper wire: The dashlights should come on full bright.	Faulty bulbs An open or high resistance in the wire
10	YELv	Parking brake pedal pressed	Check for continuity to ground: There should be continuity.	Faulty parking brake switch An open or high resistance in the wire
10	YELv	Parking brake pedal released	Check for continuity to ground: There should be no continuity.	Faulty parking brake switch A short to ground in the wire

5. Reconnect the connector, and do the following input tests:

If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, replace the gauge control module.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
1	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A26 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
17	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. D1 (7.5 A) fuse in the auxiliary under-dash fuse/relay box1 Blown No. C29 (7.5 A) fuse in the under-dash fuse/relay box2 An open or high resistance in the wire
4	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
32	BRN	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
11	PNK	Vehicle ON mode, brake fluid is at full level in the reservoir	Measure the voltage to ground: There should be battery voltage.	Faulty brake fluid level switch A short to ground in the wire
11	PNK	Vehicle ON mode, brake fluid is at lower level in the reservoir	Measure the voltage to ground: There should be less than 0.2 V.	Faulty brake fluid level switch Poor ground (G301) or an open in the ground wire An open or high resistance in the wire
31	PNK	Vehicle ON mode, dashlights brightness control ILLUMI () button pushed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty dashlights brightness control switch Poor ground (G402) or an open in the ground wire An open or high resistance in the wire
31	PNK	Vehicle ON mode, dashlights brightness control ILLUMI () button released	Measure the voltage to ground: There should be battery voltage.	Faulty dashlights brightness control switch A short to ground in the wire
29	GRN	Vehicle ON mode, dashlights brightness control ILLUMI (+) button pushed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty dashlights brightness control switch Poor ground (G402) or an open in the ground wire An open or high resistance in the wire
29	GRN	Vehicle ON mode, dashlights brightness control ILLUMI (+) button released	Measure the voltage to ground: There should be battery voltage.	Faulty dashlights brightness control switch A short to ground in the wire
8	BLU	Vehicle ON mode, ECON switch ON	Measure the voltage to ground: There should be less than 0.2 V	Faulty ECON switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire
8	BLU	Vehicle ON mode, ECON switch OFF	Measure the voltage to ground: There should be battery voltage.	Faulty ECON switch A short to ground in the wire
5	GRY	Vehicle ON mode, washer fluid is half or more in the washer reservoir	Measure the voltage to ground: There should be battery voltage.	Faulty washer fluid level switch A short to ground in the wire
5	GRY	Vehicle ON mode, washer fluid is empty in the washer reservoir	Measure the voltage to ground: There should be less than 0.2 V.	Faulty washer fluid level switch Poor ground (G201) or an open in the ground wire An open or high resistance in the wire