DTC P1794:16, P1794:17 [ADVANCED KEYLESS AND START SYSTEM]

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Detection Condition

• P1794:16: Keyless control module power voltage low (power from P/W 20 A fuse)

• P1794:17: Keyless control module power voltage rising (power from P/W 20 A fuse)

Possible Causes

• Battery malfunction

• Generator malfunction

• Keyless control module connector or terminals malfunction

• Short to ground or open circuit in wiring harness between battery and keyless control module

― Short to ground in wiring harness between battery positive terminal and keyless control module terminal 1E

― P/W 20 A fuse malfunction

― Open circuit in wiring harness between battery positive terminal and keyless control module terminal 1E

• Keyless control module malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

VERIFY PCM DTCs

•  Verify the PCM DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].)

(See ON-BOARD DIAGNOSTIC TEST [MZ-CD 1.6 (Y6)].)

(See ON-BOARD DIAGNOSTIC TEST [MZ-CD 1.4 DI Turbo].)

•  Are any DTCs displayed?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [ZJ, ZY].)

(See DTC TABLE [MZ-CD 1.6 (Y6)].)

(See DTC TABLE [MZ-CD 1.4 DI Turbo].)

No

Go to the next step.

2

BATTERY INSPECTION

•  Inspect the battery.
(See BATTERY INSPECTION [ZJ, ZY].)

(See BATTERY INSPECTION [MZ-CD 1.6 (Y6)].)

(See BATTERY INSPECTION [MZ-CD 1.4 DI Turbo].)

•  Is the battery normal?

Yes

Go to the next step.

No

Recharge or replace the battery, then go to Step 6.

(See BATTERY RECHARGING [ZJ, ZY].)

(See BATTERY RECHARGING [MZ-CD 1.6 (Y6)].)

(See BATTERY RECHARGING [MZ-CD 1.4 DI Turbo].)

(See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].)

(See BATTERY REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)

(See BATTERY REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo].)

3

GENERATOR INSPECTION

•  Inspect the generator.
(See GENERATOR INSPECTION [ZJ, ZY].)

(See GENERATOR INSPECTION [MZ-CD 1.6 (Y6)].)

(See GENERATOR INSPECTION [MZ-CD 1.4 DI Turbo].)

•  Is the generator normal?

Yes

Go to the next step.

No

Replace the generator, then go to Step 6.

(See GENERATOR REMOVAL/INSTALLATION [ZJ, ZY].)

(See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)

(See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo].)

4

INSPECT KEYLESS CONTROL MODULE CONNECTOR

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the keyless control module connector.

•  Inspect the keyless control module connector. (Corrosion, damage, and disconnected pins)

•  Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the keyless control module connector or terminal, then go to Step 6.

5

INSPECT WIRING HARNESS BETWEEN BATTERY AND KEYLESS CONTROL MODULE FOR SHORT TO GROUND AND OPEN CIRCUIT

•  Keyless control module connector is disconnected.

•  Reconnect the negative battery cable.

•  Measure the voltage at the keyless control module terminal 1E (wiring harness-side).

•  Is the voltage B+?

Yes

Go to the next step.

No

Inspect the P/W 20 A fuse.

•  If the fuse is melt:

―  Repair or replace the wiring harness for a possible short to ground.

―  Replace the fuse.

•  If the fuse is deterioration:

―  Replace the fuse.

•  If the fuse is normal:

―  Repair or replace the wiring harness for a possible open circuit.

Go to the next step.

6

VERIFY DTCs

•  Reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

•  Clear the DTCs using the M-MDS.
(See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].)

•  Verify the advanced keyless and start system DTCs using the M-MDS.
(See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].)

•  Is the following DTC displayed?

―  P1794:16

―  P1794:17

Yes

Replace the keyless control module.

(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	VERIFY PCM DTCs • Verify the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].) (See ON-BOARD DIAGNOSTIC TEST [MZ-CD 1.6 (Y6)].) (See ON-BOARD DIAGNOSTIC TEST [MZ-CD 1.4 DI Turbo].) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ZJ, ZY].) (See DTC TABLE [MZ-CD 1.6 (Y6)].) (See DTC TABLE [MZ-CD 1.4 DI Turbo].)
1		No	Go to the next step.
2	BATTERY INSPECTION • Inspect the battery. (See BATTERY INSPECTION [ZJ, ZY].) (See BATTERY INSPECTION [MZ-CD 1.6 (Y6)].) (See BATTERY INSPECTION [MZ-CD 1.4 DI Turbo].) • Is the battery normal?	Yes	Go to the next step.
2		No	Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING [ZJ, ZY].) (See BATTERY RECHARGING [MZ-CD 1.6 (Y6)].) (See BATTERY RECHARGING [MZ-CD 1.4 DI Turbo].) (See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].) (See BATTERY REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].) (See BATTERY REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo].)
3	GENERATOR INSPECTION • Inspect the generator. (See GENERATOR INSPECTION [ZJ, ZY].) (See GENERATOR INSPECTION [MZ-CD 1.6 (Y6)].) (See GENERATOR INSPECTION [MZ-CD 1.4 DI Turbo].) • Is the generator normal?	Yes	Go to the next step.
3		No	Replace the generator, then go to Step 6. (See GENERATOR REMOVAL/INSTALLATION [ZJ, ZY].) (See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].) (See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo].)
4	INSPECT KEYLESS CONTROL MODULE CONNECTOR • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Disconnect the keyless control module connector. • Inspect the keyless control module connector. (Corrosion, damage, and disconnected pins) • Are the connector and terminals normal?	Yes	Go to the next step.
4		No	Repair/replace the keyless control module connector or terminal, then go to Step 6.
5	INSPECT WIRING HARNESS BETWEEN BATTERY AND KEYLESS CONTROL MODULE FOR SHORT TO GROUND AND OPEN CIRCUIT • Keyless control module connector is disconnected. • Reconnect the negative battery cable. • Measure the voltage at the keyless control module terminal 1E (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the P/W 20 A fuse. • If the fuse is melt: ― Repair or replace the wiring harness for a possible short to ground. ― Replace the fuse. • If the fuse is deterioration: ― Replace the fuse. • If the fuse is normal: ― Repair or replace the wiring harness for a possible open circuit. Go to the next step.
6	VERIFY DTCs • Reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTCs using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].) • Verify the advanced keyless and start system DTCs using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].) • Is the following DTC displayed? ― P1794:16 ― P1794:17	Yes	Replace the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].)
6		No	DTC troubleshooting completed.