Intention of troubleshooting 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.

Step 1-6
- Perform inspection of each signal transmission system.
Step 7
- Perform a unit inspection of the current sensor.
Step 8-9
- Verify that the primary malfunction is resolved and there are no other malfunctions.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY IF CONNECTOR DAMAGE OF EACH PART AFFECTS DIAGNOSTIC RESULTS NOTE: Always disconnect current sensor connector before disconnecting the negative battery cable. Switch the ignition off. Disconnect the connector of the following parts. Current sensor Front body control module (FBCM) PCM Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 8.
1		No	Go to the next step.
2	PURPOSE: VERIFY IF OPEN CIRCUIT OR SHORT TO GROUND IN CURRENT SENSOR POWER SUPPLY CIRCUIT AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Measure the voltage at the current sensor terminal A (wiring harness-side). Is the voltage 0 V?	Yes	Inspect the MAIN 200 A fuse and ENG+B 7.5 A fuse. If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and current sensor terminal A. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Replace the malfunctioning fuse. If the fuse is damaged: Replace the malfunctioning fuse. If all fuses are normal: Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and current sensor terminal A. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 8.
2		No	Go to the next step.
3	PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Current sensor terminal B Front body control module (FBCM) terminal 2R Front body control module (FBCM) terminal 2L Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Current sensor terminal B-Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2R-PCM terminal 2AK Front body control module (FBCM) terminal 2L-PCM terminal 2AL If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to Step 8.
3		No	Go to the next step.
4	PURPOSE: VERIFY IF SHORT TO POWER SUPPLY IN CURRENT SENSOR POWER SUPPLY CIRCUIT AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Switch the ignition ON (engine off). NOTE: Another DTC may be stored by the PCM detecting an open circuit. Measure the voltage at the current sensor terminal A (wiring harness-side). Is the voltage above B+?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and current sensor terminal A. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
4		No	Go to the next step.
5	PURPOSE: VERIFY IF SHORT TO POWER SUPPLY IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Measure the voltage at the following terminals (wiring harness-side): Current sensor terminal B Front body control module (FBCM) terminal 2R Front body control module (FBCM) terminal 2L Is the voltage 0 V?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Current sensor terminal B-Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2R-PCM terminal 2AK Front body control module (FBCM) terminal 2L-PCM terminal 2AL If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
5		No	Go to the next step.
6	PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS Verify that the current sensor, front body control module (FBCM) and PCM connectors are disconnected. Switch the ignition off. Inspect for continuity between the following terminals (wiring harness-side): Current sensor terminal B- Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2R-PCM terminal 2AK Front body control module (FBCM) terminal 2L- PCM terminal 2AL Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Current sensor terminal B-Front body control module (FBCM) terminal 2E Front body control module (FBCM) terminal 2R-PCM terminal 2AK Front body control module (FBCM) terminal 2L-PCM terminal 2AL If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 8.
7	PURPOSE: DETERMINE INTEGRITY OF CURRENT SENSOR Inspect the current sensor. (See CURRENT SENSOR INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Is there any malfunction?	Yes	Replace the current sensor, then go to the next step. (See CURRENT SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
7		No	Go to the next step.
8	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Always reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .) Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Go to the next step.
8		No	Go to the next step.
9	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION Is any other DTC or pending code stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .)
9		No	DTC troubleshooting completed.