Troubleshooting Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Intention of troubleshooting procedure

Steps 1 to 3
- Verify if the malfunction is due to a blown capacitor fuse and poor tightening of the bolts.
Step 4
- Verify if the malfunction is caused by poor engagement of each part.
Steps 5 to 7

Verify that primary malfunction is resolved and there are no other malfunctions.

Step	Inspection	Results	Action
1	PURPOSE: VERIFY IF MALFUNCTION IS CAUSED BY BLOWN CAPACITOR FUSE Switch the ignition OFF (LOCK). Remove the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP] .) Remove the capacitor fuse. (See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP] .) Is the capacitor fuse blown?	Yes	NOTE: The procedure may have been performed while the service plug was installed, and the capacitor fuse may have blown. Replace the capacitor fuse, then go to Step 3.(See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP] .)
1		No	Go to the next step.
2	PURPOSE: VERIFY IF MALFUNCTION IS CAUSED BY POOR TIGHTENING OF BOLTS INSTALLED TO CAPACITOR Verify the bolt tightening condition. (See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP] .) Is the bolt tightening condition normal?	Yes	Replace the capacitor, then go to the next step. (See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP] .)
2		No	Tighten the bolts correctly, then go to the next step.
3	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Reconnect all disconnected connectors and hoses. Install the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP] .) Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) Perform the following procedure: Start the engine. Wait for 1 min while idling. Stop the engine. Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) Is DTC P1794:00 displayed?	Yes	If capacitor is not replaced: Replace the capacitor, then perform the malfunction diagnostic procedure in Step 3. (See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP] .) If capacitor is replaced: Perform diagnostic from Step 1 of the "Function inspection using M-MDS". If the malfunction recurs, replace the PCM, then go to Step 7. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
3		No	Go to Step 6.
4	PURPOSE: VERIFY IF MALFUNCTION IS CAUSED BY POOR ENGAGEMENT OF EACH PART Switch the ignition OFF (LOCK). Remove the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP] .) Verify that the following parts are engaged correctly. DC-DC converter (i-ELOOP) (See DC-DC CONVERTER REMOVAL/INSTALLATION [i-ELOOP] .) Capacitor (See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP] .) Is the engagement condition of each part normal?	Yes	Go to the next step.
4		No	Engage the DC-DC converter (i-ELOOP) or capacitor properly, then go to the next step.
5	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Reconnect all disconnected connectors and hoses. Install the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP] .) Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) Implement repeatability verification procedure 1. (See Repeatability Verification Procedure .) Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) Is DTC P1794:00 displayed?	Yes	If capacitor is not replaced: Replace the capacitor, then perform the malfunction diagnostic procedure in Step 5. (See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP] .) If capacitor is replaced: Perform diagnostic from Step 1 of the "Function inspection using M-MDS". If the malfunction recurs, replace the PCM, then go to Step 7. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
5		No	Go to the next step.
6	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Implement repeatability verification procedure 2. (See PID Item/Simulation Item Used In Diagnosis.) Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) Is DTC P1794:00 displayed?	Yes	If capacitor is not replaced: Replace the capacitor, then perform the malfunction diagnostic procedure in Step 5. (See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP] .) If capacitor is replaced: Perform diagnostic from Step 1 of the "Function inspection using M-MDS". If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
6		No	Go to the next step.
7	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .)
7		No	DTC troubleshooting completed.