PCM INSPECTION [MZI-3.7]

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  Caution
  • The PCM terminal voltage can vary with the conditions when measuring and changes due to aged deterioration on the vehicle, causing false diagnosis. Therefore determine comprehensively where the malfunction occurs among the input systems, output systems, and the PCM.

PCM inspection preparation

1. Disconnect the negative battery cable.

2. Remove the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].)

3. Remove the windshield wiper arm and blade. (See WINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION.)

4. Remove the cowl grille. (See COWL GRILLE REMOVAL/INSTALLATION.)

5. Remove the windshield wiper motor. (See WINDSHIELD WASHER MOTOR REMOVAL/INSTALLATION.)

6. Remove the cowl panel. (See COWL PANEL REMOVAL/INSTALLATION.)

7. Remove the PCM connector still connected.

8. Install the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].)

9. Connect the negative battery cable.

Typical Diagnostic Reference Values (PCM Terminal Voltage and/or Data Monitor)

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PCM Terminal (Reference) | Sensors/Inputs | Measured/PID Values | Units Measured/PID
--- | --- | --- | ---
KOEO | Hot Idle | 48 KM/H (30MPH) | 89 KM/H (55MPH)
1G | PSP | 0.1/LOW | VBAT/HIGH (I) | 0.1/LOW | 0.1/LOW | DCV/HIGH-LOW
1BF | GENMN (GFS) | 11.89/0 | VBAT/50 | VBAT/28 | VBAT/25 | DCV/%
1Y | APP1 | 3.9 | 3.9 | 3.5 | 3.3 | DCV
1U | APP2 | 1.6 | 1.7 | 1.8 | 2.1 | DCV
1H | FPM | OFF | ON | ON | ON | ON-OFF
1M | ACP | 0.8/70 | 0.86/73 | 0.9/75 | 1.0/87 | DCV/psi
1AR | MAF | 0 | 0.7 | 1.4 | 1.5 | DCV
1AN | MAF SIGRTN | 0 | 0.6-1.9 | 1-1.6 | 1.3-2.3 | DCV
1P | IAT | 80 (K) | 50 (K) | 37 (K) | 34 (K) | DEG F
1I | FTP | 2.6/-0.01 | 2.6/-0.01 | 2.6/-0.01 | 2.6/-0.01 | DCV/psi
1S | BOO | VBAT/OFF | 0.1/ON (E) | VBAT/OFF | VBAT/OFF | DCV/ON-OFF
1T | BPA | 0.1/OFF | VBAT/ON (E) | 0.1/OFF | 0.1/OFF | DCV/ON-OFF
1N | SCCS | 5 | 0.1(P) | 5 | 5 | DCV
3Z | HO2S12 | (L) | (D) | (D) | (D) | DCV
3AB | HO2S22 | 0.1 | (D) | (D) | (D) | DCV
2AO | HO2S21 | 0 | switching (C) | switching (C) | switching (C) | DCV
2AS | HO2S11 | (L) | switching (C) | switching (C) | switching (C) | DCV
2AV | CHT | 3.6/199 | 3.6/199 | 3.58/201 | 3.45/208 | DCV/DEG F
2X | CMP2 | 0 | 5-7 | 13-16 | 20-23 | Hz
2T | CMP1 | 0 | 5-7 | 13-16 | 20-23 | Hz
2V | CKP | 0 | 400-500 | 850-1050 | 1050-1150 | Hz
2AF | KNOCK 1 | 23.99k | 25.01k | 25.73k | 44.51k | N/A
2AL | TP2 | 1.1/25 | 0.8/15 | 1.0/19 | 1.4/27 | DCV/%
2AN | TP1 | 4.1/17 | 4.4/13 | 4.2/16 | 4.0/19 | DCV/%
— | ACCS | VBAT/OFF | VBAT/ON (A) | VBAT/OFF | VBAT/OFF | DCV/ON-OFF
— | APP | 3.9 | 0 | 0 | 22 | %
— | APP_FLT | NO FAULT | NO FAULT | NO FAULT | NO FAULT | FAULT- NO FAULT
— | CPP/PNP | NEUTRAL | NEUTRAL | DRIVE | DRIVE | NEUTRAL-DRIVE
— | ETC_ACT | 7.56 | 1.27 | 6.22 | 12.74 | DEG
— | ETC_DSD | 7.62 | 1.31 | 6.19 | 12.73 | DEG
— | ETC_TRIM | 0.23 | 0.21 | 0.24 | 0.24 | DEG
— | FANVAR | NO FAULT | NO FAULT | NO FAULT | NO FAULT | FAULT- NO FAULT
— | FLI | 71 (H) | 72 (H) | 82 (H) | 81 (H) | %
— | LOAD | 51.4 (L) | 16.1 | 35.4 | 34.7 | %
— | MISFIRE | NO | NO | NO | NO | YES-NO
— | RPM | 0 | 600 | 1200 | 1500 | RPM
— | VSS | 0 | 0 | 30 | 55 | MPH
— | WAC F | NO FAULT | NO FAULT | NO FAULT | NO FAULT | FAULT- NO FAULT

PCM Terminal (Reference) | Actuators/ Outputs | Measured/PID Values | Units Measured/PID
--- | --- | --- | ---
KOEO | Hot Idle | 48 KM/H (30MPH) | 89 KM/H (55MPH)
— | GENFDC | 3.79 | 0 | 0 | 0 | %
1AQ | SMC | 0 | 0 | 0 | 0 | DCV
2H | EVAPCV | 0 | 0 | 0 | 0 | %
1W | WAC/ACCR | OFF | OFF | OFF | OFF | ON-OFF
3N | HTR12 | VBAT/OFF | 0.2/ON | 0.2/ON | 0.2/ON | DCV/ON-OFF
3AM | HTR22 | VBAT/OFF | 0.2/ON | 0.2/ON | 0.2/ON | DCV/ON-OFF
2D | CD6F (CYL 6) | VBAT | VBAT | VBAT | VBAT | DCV
2C | CD5D (CYL 5) | VBAT | VBAT | VBAT | VBAT | DCV
2AX | CD4B (CYL 4) | VBAT | VBAT | VBAT | VBAT | DCV
2B | CD3E (CYL 3) | VBAT | VBAT | VBAT | VBAT | DCV
2AT | CD2C (CYL 2) | VBAT | VBAT | VBAT | VBAT | DCV
2BB | CD1A (CYL 1) | VBAT | VBAT | VBAT | VBAT | DCV
2BR | TACM (+) | 3.7 | VBAT | VBAT | VBAT | DCV
2BC | INJ2 | 0 | 2.6-3.2 | 2.5-5.5 | 3.5-8.5 | mS
2BG | INJ4 | 0 | 2.6-3.2 | 2.5-5.5 | 3.5-8.5 | mS
2BI | INJ6 | 0 | 2.6-3.2 | 2.5-5.5 | 3.5-8.5 | mS
2BO | TACM (-) | 3.7 | VBAT | VBAT | VBAT | DCV
2BQ | INJ1 | 0 | 2.6-3.2 | 2.5-5.5 | 3.5-8.5 | mS
2AY | INJ3 | 0 | 2.6-3.2 | 2.5-5.5 | 3.5-8.5 | mS
2BL | INJ5 | 0 | 2.6-3.2 | 2.5-5.5 | 3.5-8.5 | mS
— | VCTADV | 0 | -.031 | -27.56 | -30.94 | DEG
— | VCTADV2 | 0 | 0 | -27.69 | -31.06 | DEG
2J | HTR11 | 0.1/ON (O) | 0.1/ON | 0.1/ON | 0.1/ON | DCV/ON-OFF
2E | HTR21 | 0.1/ON (O) | 0.1/ON | 0.1/ON | 0.1/ON | DCV/ON-OFF
1BI | FP | ON/OFF | ON | ON | ON | ON-OFF
— | LONGFT1 | (L) | (-)20-(+)20 | (-)20-(+)20 | (-)20-(+)20 | %
— | LONGFT2 | (L) | (-)20-(+)20 | (-)20-(+)20 | (-)20-(+)20 | %
— | MIL | OFF | OFF | OFF | OFF | ON-OFF
— | SHRTFT1 | (L) | (-)10-(+)10 | (-)10-(+)10 | (-)10-(+)10 | %
— | SHRTFT2 | (L) | (-)10-(+)10 | (-)10-(+)10 | (-)10-(+)10 | %
— | SPARKADV | 10 | 13.25 | 44 | 45.25 | DEG
2BP | VCTDC | 0 | 0 | 47.32 | 80 | %
2BK | VCTDC2 | 0 | 0 | 46.8 | 80 | %
— | VCTADVERR | 0 | 0.18 | -0.37 | -0.18 | DEG
— | VCTADVERR2 | 0 | 0.06 | -0.43 | 0 | DEG

PCM Terminal (Reference) | Other | Measured/PID Values | Units Measured/PID
--- | --- | --- | ---
KOEO | Hot Idle | 48 KM/H (30MPH) | 89 KM/H (55MPH)
1X, 1Z, 2AP | ETCVREF | 5 | 5 | 5 | 5 | DCV
1D, 1BJ | VREF | 5 | 5 | 5 | 5 | DCV
1BP, 1BK | VPWR | VBAT | VBAT | VBAT | VBAT | DCV
1V | KAPWR | VBAT | VBAT | VBAT | VBAT | DCV