Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

WILL NOT CRANK (SKYACTIV-G, US) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	INSPECT POWER SUPPLY Access the VPWR PID using the M-MDS. (See PID/DATA MONITOR INSPECTION .) Verify the VPWR PID value. Is the VPWR PID value B+?	Yes	Go to the next step.
1		No	Inspect the following: Battery connection Battery condition (See BATTERY INSPECTION [(US)] .) Fuse (See BLOWN FUSES (US) .) If there is any malfunction: Repair or replace the malfunctioning location, then repeat this step.
2	DETERMINE IF MALFUNCTION CAUSE IS IMMOBILIZER SYSTEM OR OTHER Are any of the following conditions present? Engine does not start completely. PCM DTC P1260:00 is displayed.	Yes	Both conditions present: Go to Step 5.
2		No	Either or other condition present: Go to the next step.
3	INSPECT PUSH BUTTON START CONNECTOR CONNECTION Inspect the connection of push button start connector. Is the push button start connector securely connected to the coil antenna?	Yes	Go to the next step.
3		No	Reconnect the push button start securely, then repeat from Step 2.
4	DETERMINE IF MALFUNCTION CAUSE IS INSTRUMENT CLUSTER OR OTHER Switch the ignition ON (engine off). Does the security indicator light flash?	Yes	Go to the next step.
4		No	Inspect the wiring harness between the following terminals: Instrument cluster terminal AK-Climate control unit terminal 1I Instrument cluster terminal AM-Climate control unit terminal 1K Climate control unit terminal 1J-Body control module (BCM) terminal 2L Climate control unit terminal 1L-Body control module (BCM) terminal 2J Body control module (BCM) terminal 3X-PCM terminal 2S Body control module (BCM) terminal 3W-PCM terminal 2T If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification. Inspect the instrument cluster (See INSTRUMENT CLUSTER INSPECTION [(US)] .) If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
5	VERIFY IMMOBILIZER SYSTEM (LF CONTROL UNIT) DTC Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [BODY CONTROL MODULE (BCM) (US)] .)
5		No	Go to the next step.
6	VERIFY PCM DTC Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Are any continuous memory DTCs present?	Yes	Continuous memory DTC is displayed: Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G (US))] .) Communication error message is displayed: Go to the next step.
6		No	Go to Step 12.
7	INSPECT MAIN RELAY CONTROL CIRCUIT FOR OPEN CIRCUIT Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT PCM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT MAIN RELAY FOR MALFUNCTION Inspect the applicable part. (See RELAY INSPECTION .) Is the part normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See RELAY LOCATION [(US)] .)
10	INSPECT CAN COMMUNICATION LINE BETWEEN DLC-2 AND PCM FOR OPEN CIRCUIT Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT PCM GROUND CIRCUIT FOR OPEN CIRCUIT Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	DETERMINE IF MALFUNCTION CAUSE IS STARTER RELAY CONTROL CIRCUIT OR OTHER Crank the engine. Is a clicking sound heard from the starter relay?	Yes	Go to Step 23.
12		No	ATX: Go to Step 16. MTX: Go to the next step.
13	DETERMINE IF MALFUNCTION CAUSE IS STARTER INTERLOCK SWITCH OR OTHER Switch the ignition off. Short the starter interlock switch terminals A and B (wiring harness-side) using a jumper wire. Crank the engine. Does the engine start?	Yes	Inspect the starter interlock switch. (See STARTER INTERLOCK SWITCH INSPECTION [SKYACTIV-G (VIN L (US))] .) If there is any malfunction: Replace the starter interlock switch and perform the repair completion verification. (See STARTER DISASSEMBLY/ASSEMBLY .) If there is no malfunction: Go to the next step.
13		No	Go to the next step.
14	INSPECT STARTER INTERLOCK SWITCH CONNECTOR FOR MALFUNCTION Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .) Are the connector and terminal normal?	Yes	Go to the next step.
14		No	Repair or replace the malfunctioning location and perform the repair completion verification.
15	INSPECT STARTER INTERLOCK SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to Step 18.
15		No	Repair or replace the malfunctioning location and perform the repair completion verification.
16	INSPECT TCM CONNECTOR FOR MALFUNCTION Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .) Are the connector and terminal normal?	Yes	Go to the next step.
16		No	Repair or replace the malfunctioning location and perform the repair completion verification.
17	INSPECT TCM SIGNAL CIRCUIT FOR OPEN CIRCUIT Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
17		No	Repair or replace the malfunctioning location and perform the repair completion verification.
18	INSPECT STARTER RELAY FOR MALFUNCTION Inspect the applicable part. (See RELAY INSPECTION .) Is the part normal?	Yes	Go to the next step.
18		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See RELAY LOCATION [(US)] .)
19	INSPECT BODY CONTROL MODULE (BCM) CONNECTOR FOR MALFUNCTION Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .) Are the connector and terminal normal?	Yes	Go to the next step.
19		No	Repair or replace the malfunctioning location and perform the repair completion verification.
20	INSPECT PCM CONNECTOR FOR MALFUNCTION Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .) Are the connector and terminal normal?	Yes	Go to the next step.
20		No	Repair or replace the malfunctioning location and perform the repair completion verification.
21	INSPECT STARTER RELAY CONTROL CIRCUIT FOR SHORT TO GROUND Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
21		No	Repair or replace the malfunctioning location and perform the repair completion verification.
22	INSPECT STARTER RELAY CONTROL CIRCUIT FOR OPEN CIRCUIT Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Inspect the body control module (BCM). (See BODY CONTROL MODULE (BCM) INSPECTION [(US)] .) If there is any malfunction: Replace the body control module (BCM) and perform the repair completion verification. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(US)] .) If there is no malfunction: Go to the next step.
22		No	Repair or replace the malfunctioning location and perform the repair completion verification.
23	INSPECT STARTER CONNECTOR FOR MALFUNCTION Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION .) Are the connector and terminal normal?	Yes	Go to the next step.
23		No	Repair or replace the malfunctioning location and perform the repair completion verification.
24	DETERMINE IF MALFUNCTION CAUSE IS STARTER OR OTHER Verify that the starter connector is disconnected. Crank the engine. Measure the voltage at the starter terminal 2A (wiring harness-side) Is the voltage B+?	Yes	Go to Step 28.
24		No	Go to the next step.
25	INSPECT STARTER RELAY POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
25		No	Repair or replace the malfunctioning location and perform the repair completion verification.
26	INSPECT POWER SUPPLY CIRCUIT BETWEEN STARTER RELAY AND STARTER FOR SHORT TO GROUND Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
26		No	Repair or replace the malfunctioning location and perform the repair completion verification.
27	INSPECT POWER SUPPLY CIRCUIT BETWEEN STARTER RELAY AND STARTER FOR OPEN CIRCUIT Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
27		No	Repair or replace the malfunctioning location and perform the repair completion verification.
28	INSPECT POWER SUPPLY CIRCUIT BETWEEN BATTERY AND STARTER FOR SHORT TO GROUND AND OPEN CIRCUIT Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
28		No	Repair or replace the malfunctioning location and perform the repair completion verification.
29	INSPECT STARTER FOR MALFUNCTION Inspect the applicable part. (See STARTER INSPECTION [SKYACTIV-G (VIN M (US))] .) (See STARTER INSPECTION [SKYACTIV-G (VIN L (US))] .) Is the part normal?	Yes	Go to the next step.
29		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See STARTER REMOVAL/INSTALLATION [SKYACTIV-G (VIN M (US))] .) (See STARTER REMOVAL/INSTALLATION [SKYACTIV-G (VIN L (US))] .)
30	INSPECT IMMOBILIZER SYSTEM RELATED CIRCUIT Inspect the following wiring harness and connectors: Between push button start terminal B and LF control unit terminal AF Between push button start terminal A and LF control unit terminal AE Between LF control unit terminal M and climate control unit terminal 1I Between LF control unit terminal P and climate control unit terminal 1K Between climate control unit terminal 1J and body control module (BCM) terminal 2L Between climate control unit terminal 1L and body control module (BCM) terminal 2J Between body control module (BCM) terminal 3X and PCM terminal 2S Between body control module (BCM) terminal 3W and PCM terminal 2T Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
30		No	Go to the next step.
31	VERIFY PRESENT MALFUNCTION DTC Perform the KOEO self test. (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G (US))] .)
31		No	Go to the next step.
32	DETERMINE IF MALFUNCTION CAUSE IS BASE ENGINE OR OTHER Inspect for a seized flywheel (MTX) or drive plate (ATX). Is the flywheel (MTX) or drive plate (ATX) seized?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification.
32		No	Base engine malfunction or engine damage during compression due to liquid (such as water, fuel, or engine oil) penetration into cylinder. Overhaul or replace the engine and perform the repair completion verification.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification 1		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, go to the next step.
Repair completion verification 2	VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING Verify repair information and verify that there is a new calibration in the PCM. Is there a new calibration in the PCM?	Yes	Perform the PCM reprogramming and verify if the malfunction symptom was corrected. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (VIN M (US))] .) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (VIN L (US))] .)
Repair completion verification 2		No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (VIN M (US))] .) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (VIN L (US))] .)