Main Relay Operation Inspection
- Verify that the main relay clicks when the ignition switch is turned to the ON position, then off. If there is no operation sound, inspect the following: Main relay (See «RELAY INSPECTION».) Wiring harness and connector between battery and main relay terminal C Wiring harness and connector between PCM terminal 1AJ and main relay terminal B
Brake override system operation inspection
Note. If the brake override system operates normally after performing the following inspection, the PCM detects DTC P2299:00.
- Start the engine and idle it.
- Verify that the engine speed is below 1,100 rpm while the all of the following conditions are met. Neutral (MTX) P, or N position (ATX) Engine speed is above 1,150 rpm while not idling. Brake pedal is depressed. If the engine speed is below 1,100 rpm, clear the PCM DTC using the M-MDS. (System operation is normal.) If the engine speed is not below 1,100 rpm, inspect the following: APP sensor (See «ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [MZR 1.5]».) Neutral switch (MTX) (See «NEUTRAL SWITCH INSPECTION [MZR 1.5]».) Clutch switch (MTX) (See «CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [MZR 1.5]».) TR switch (ATX) (See «TRANSAXLE RANGE (TR) SWITCH INSPECTION [FN4A-EL]».) Brake switch No.1 (See «BRAKE SWITCH INSPECTION [MTX]».) Brake switch No.2 (See «BRAKE SWITCH INSPECTION [MTX]».) Communication between PCM and TCM (ATX) (See «FOREWORD [MULTIPLEX COMMUNICATION SYSTEM]».)
Variable Tumble Control Operation Inspection
- Connect the M-MDS to the DLC-2.
- Perform the KOEO self test using M-MDS. (See «KOEO/KOER SELF TEST [MZR 1.5]»(/mazda/2/ii-2010-2014/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-mzr-15) .)
- Verify that DTC P2004:00, DTC P2006:00 and DTC P2008:00 are not displayed. If DTC P2004:00, DTC P2006:00 or DTC P2008:00 is shown, perform the DTC inspection. (See «DTC P2008:00 [MZR 1.5]»(/mazda/2/ii-2010-2014/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-mzr-15) .)
- Switch the ignition to ON (engine off).
- Monitor ECT1, RPM and IMRC PIDs. (See «ON-BOARD DIAGNOSTIC TEST [MZR 1.5]»(/mazda/2/ii-2010-2014/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-mzr-15) .)
- Verify that ECT1 PID is 60 °C {140 °F} or less .
- Start the engine.
- Verify that IMRC PID is following while ECT1 PID is 60 °C {140 °F} or less. If the IMRC PID is not as specified, inspect APP sensor, MAF sensor and TP sensor. (See «THROTTLE POSITION (TP) SENSOR INSPECTION [MZR 1.5]».) ENGINE SPEED SPECIFICATIONS Engine speed 3,250 rpm Less than More than IMRC PID ON OFF
- Command the IMRC PID from OFF to ON and from ON to OFF using the active command function.
- Verify that the PCM terminal 2AL voltage change according to IMRC commanded value. (See «PCM INSPECTION [MZR 1.5]».) If the PCM terminal 2AL voltage cannot be verified, inspect the following: Variable tumble shutter valve actuator (See «VARIABLE TUMBLE SHUTTER VALVE ACTUATOR INSPECTION [MZR 1.5]».) Variable tumble shutter valve actuator stuck open or close Variable tumble shutter valve actuator position sensor (See «VARIABLE TUMBLE SHUTTER VALVE ACTUATOR INSPECTION [MZR 1.5]».)
Fuel Injector Operation Inspection
If simulation function of M-MDS is used
| STEP | INSPECTION | RESULTS | ACTION |
|---|---|---|---|
| 1 | Start the engine and warm it up until normal operating temperature. Access the INJ_1, INJ_2, INJ_3 and INJ_4 PIDs. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.5] .) Turn the fuel injector from on to off using the PIDs for each cylinder. Does the engine speed drop? | Yes | Fuel injector works properly. |
| No | Go to the next step. | ||
| 2 | Disconnect the fuel injector connector that the engine speed does not drop at Step 1. Switch the ignition to ON. Measure the voltage at the suspected fuel injector terminal A (wiring harness-side). Is the voltage B+ ? | Yes | Go to the next step. |
| No | Repair or replace the wiring harness for a possible open or short circuit. | ||
| 3 | Inspect for open or short circuit between the following terminals (wiring harness-side): Fuel injector No.1 terminal B-PCM terminal 2A Fuel injector No.2 terminal B-PCM terminal 2B Fuel injector No.3 terminal B-PCM terminal 2C Fuel injector No.4 terminal B-PCM terminal 2H Is there any malfunction? | Yes | Repair or replace the wiring harness for a possible open or short circuit. |
| No | Go to the next step. | ||
| 4 | Inspect the suspect fuel injector. (See «FUEL INJECTOR INSPECTION [MZR 1.5]».) Is there any malfunction? | Yes | Replace the fuel injector. (See «FUEL INJECTOR REMOVAL/INSTALLATION [MZR 1.5]».) |
| No | Replace the PCM. (See «PCM REMOVAL/INSTALLATION [MZR 1.5]».) |
If simulation function of M-MDS is not used
| STEP | INSPECTION | RESULTS | ACTION |
|---|---|---|---|
| 1 | Inspect for fuel injector operation sound at each cylinder using a soundscope while cranking the engine. Is the operation sound heard? | Yes | Fuel injector works properly. |
| No | Go to the next step. | ||
| 2 | Disconnect the fuel injector connector that the fuel injector operation sound is not heard at Step 1. Switch the ignition to ON. Measure the voltage at the suspected fuel injector terminal A (wiring harness-side). Is the voltage B+ ? | Yes | Go to the next step. |
| No | Repair or replace the wiring harness for a possible open or short circuit. | ||
| 3 | Inspect for open or short circuit between the following terminals (wiring harness-side): Fuel injector No.1 terminal B-PCM terminal 2A Fuel injector No.2 terminal B-PCM terminal 2B Fuel injector No.3 terminal B-PCM terminal 2C Fuel injector No.4 terminal B-PCM terminal 2H Is there any malfunction? | Yes | Repair or replace the wiring harness for a possible open or short circuit. |
| No | Go to the next step. | ||
| 4 | Inspect the suspect fuel injector. (See «FUEL INJECTOR INSPECTION [MZR 1.5]».) Is there any malfunction? | Yes | Replace the fuel injector. (See «FUEL INJECTOR REMOVAL/INSTALLATION [MZR 1.5]».) |
| No | Replace the PCM. (See «PCM REMOVAL/INSTALLATION [MZR 1.5]».) |
Fuel Pump Operation Inspection
- Connect the M-MDS to the DLC-2.
- Remove the fuel-filler cap.
- Switch the ignition to ON.
- Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound is heard. (See «ON-BOARD DIAGNOSTIC TEST [MZR 1.5]»(/mazda/2/ii-2010-2014/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-mzr-15) .) If no operation sounds is heard, proceed to next step.
- Measure the voltage at the fuel pump terminal B (wiring harness-side). Specification B+ (Ignition switch is ON position) If the voltage is as specified, inspect the following: Fuel pump continuity Fuel pump ground Wiring harness between fuel pump relay and PCM terminal 1AQ If not as specified, inspect the following: Fuel pump relay (See «RELAY INSPECTION».) Wiring harness and connector (Main relay-Fuel pump relay-Fuel pump)
Cooling fan system operation
| Engine condition | Cooling fan relay | Cooling fan | ||
|---|---|---|---|---|
| No.1 | No.2 | |||
| ECT: 100 °C {212 °F} or less | OFF | OFF | Stop | |
| ECT: 100 °C {212 °F} or more (until 97 °C {207 °F} or less ) | ON | OFF | Low speed | |
| ECT: 108 °C {226 °F} or more (until 105 °C {221 °F} ) | ON | ON | High speed | |
| A/C and fan switches are on | Refrigerant pressure switch (middle pressure) OFF | ON | OFF | Low speed |
| Refrigerant pressure switch (middle pressure) ON | ON | ON | High speed | |
| ECT sensor malfunction | ON | ON | High speed | |
- Connect the M-MDS to the DLC-2.
- Perform the KOEO or KOER self test and verify that DTCs P0117:00, P0118:00, P0480:00 and/or P0481:00 are not shown using the KOEO and/or KOER self test. (See «KOEO/KOER SELF TEST [MZR 1.5]»(/mazda/2/ii-2010-2014/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-mzr-15) .) If DTCs P0117:00, P0118:00, P0480:00 and/or P0481:00 are shown, perform the applicable DTC troubleshooting procedure. (See «DTC P0481:00 [MZR 1.5]»(/mazda/2/ii-2010-2014/remont/testing-diagnostics/#on-board-diagnostic-engine-control-system-mzr-15) .)
- Start the engine and let it at idle with ECT below 100 °C {212 °F} .
- Verify that the cooling fan is not operating when A/C switch and fan switch are turned off. If the cooling fan is operating, inspect for the following based on cooling fan status: Cooling fan status Inspection item Low speed Cooling fan relay No.1 (stuck close) Cooling fan relay No.2 (stuck close) Wiring harness between refrigerant pressure switch (low, high) and PCM terminal 1AO (1) (short to ground) (PCM PID AC_REQ is always ON) Wiring harness between cooling fan relay No.1 and cooling fan (short to power supply) Wiring harness between cooling fan relay No.2 and cooling fan (short to power supply) High speed Wiring harness between refrigerant pressure switch (low, high) and PCM terminal 1AO (2) (short to ground) (PCM PID AC_REQ is always ON) (1) While refrigerant pressure switch (middle) is OFF (2) While refrigerant pressure switch (middle) is ON
- Using the M-MDS simulation function, turn FAN1 from the off position to the ON position, and verify that cooling fan operates at low speed. If the operation could not be confirmed, inspect for the following based on cooling fan status: Cooling fan status Inspection item Stop Cooling fan relay No.1 (stuck open) Cooling fan (internal circuit open) Wiring harness in battery-cooling fan relay No.1-cooling fan (open circuit, fuse is melted by short to ground) Wiring harness in cooling fan-body ground (open circuit) Poor contact of cooling fan ground point High speed Cooling fan (internal circuit short) Wiring harness of cooling fan power supply circuit (from cooling fan No.1 and from cooling fan relay No.2) (short to each other)
- Using the M-MDS simulation function, turn FAN1 and FAN2 from the off position to the ON position, and verify that cooling fan operates at high speed. If the operation could not be confirmed, inspect for the following based on cooling fan status: Cooling fan status Inspection item Low speed Cooling fan relay (stuck open) Cooling fan (internal circuit open) Wiring harness between battery positive terminal and cooling fan relay (open circuit, fuse is melted by short to ground) Wiring harness between cooling fan terminal A and body ground (open circuit) Wiring harness between cooling fan terminal B and body ground (open circuit)