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Pin Voltage Specifications

Pin voltage charts are supplied to reduce diagnostic time. Checking pin voltages at the Electronic Control Module (ECM) determines if it is receiving and transmitting proper voltage signals. Charts may also help determine if ECM wiring harness is shorted or open. See Fig 1 -Fig 2 .

Fig 1: Identifying ECM Pin Terminals (1.6L SOHC)
G91F16878Courtesy of ISUZU MOTOR CO.
ECM CONNECTOR A-B (24 PIN) TERMINAL PIN VOLTAGE (1.6L SOHC)

PIN & WIRE COLOR CIRCUIT NAME VOLTAGE KEY ON VOLTAGE ENGINE RUN
(A1) C47-1 (PNK/WHT) Fuel Pump Relay B+ (1) B+
(A2) C47-2 (GRY/RED) A/C Cut Out 0 0 ON B+ OFF
(A5) C47-5 (VLT) Check Engine Light 0 B+
(A6) C47-6 (RED/GRN) Ignition Feed Main Relay B+ B+
(A8) C47-8 (ORG/BLK) Serial Data Output 5.0 5.0
(A9) C47-9 (ORG/YEL) Diagnostic Request B+ B+
(A10) C47-10 (WHT) VSS Signal Input 0 or B+ B+ (2)
(A11) C47-11 (GRY) Coolant, MAP Sensor Ground 0 0
(A12) C47-12 (BLK/BLU) ECM Ground 0 0
(B1) C47-13 (RED/WHT) SBF Box (30A) B+ B+
(B3) C47-15 (YEL/BLK) Distributor Reference Ground 0 0
(B5) C47-17 (YEL/RED) Distributor Reference Input Signal 0 1.0
(B8) C47-20 (GRN/ORG) A/C Request Input 0 0 OFF B+ ON
(B10) C47-22 (PNK/BLU) P/N Switch (A/T) 0 (3) 0 (3)
(B12) C47-24 (GRY/BLW) EGR Gas Temperature Sensor Input N/A N/A
(1) Reads B+ for 2 seconds after ign. is turned on, then zero volts.
(2) Varies with vehicle speed.
(3) B+ in R, D or L gear positions.
ECM CONNECTOR C-D (32 PIN) TERMINAL PIN VOLTAGE (1.6L SOHC) (2)

PIN & WIRE COLOR CIRCUIT NAME VOLTAGE KEY ON VOLTAGE ENGINE RUN
(C1) C46-1 (ORG/BLU) Shift Indicator Relay (M/T) B+ B+
(C3) C46-3 (BRN/YEL) IAC (Coil B Low) Not Used Not Used
(C4) C46-4 (BRN/RED) IAC (Coil B High) Not Used Not Used
(C5) C46-5 (BRN/BLK) IAC (Coil A High) Not Used Not Used
(C6) C46-6 (BRN/WHT) IAC (Coil A Low) Not Used Not Used
(C7) C46-7 (GRN/YEL) Power Steering Switch Input B+ B+
(C10) C46-10 (GRY/BLK) ECT Sensor Signal Input Varies With Temp. Varies With Temp.
(C11) C46-11 (GRY/RED) MAP Sensor Signal Input 4.79V (1)
(C12) C46-12 (BLU/BLK) MAT Sensor Signal Input Varies With Temp. Varies With Temp.
(C13) C46-13 (YEL/BLU) TPS Signal Input 0.64 0.64
(C14) C46-14 (BLU/ORG) +5V Reference Voltage Output 5.0 5.0
(C15) C46-15 (BLU/YEL) Injection 3 & 4 Drive B+ B+
(C16) C46-16 (RED/WHT) SBF Box (30A) B+ B+
(D1) C46-17 (BLK/BLU) ECM Ground 0 0
(D2) C46-18 (BLK) TPS, MAT Sensor Ground 0 0
(D3) C46-19 (BLK/BLU) Engine Ground 0 0
(D4) C46-20 (YEL) EST Output 0 1.15
(D5) C46-21 (YEL/GRN) Ignition Module Bypass Circuit 0 5
(D6) C46-22 (BLK/BLU) O2 Sensor Engine Ground Circuit 0 0
(D7) C46-23 (LTBLU) O2 Sensor Input Signal 0.45 0.1-0.9
(D8) C46-24 (BLK/BLU) Engine Ground 0 0
(D12) C46-28 (WHT/GRN) EGR Control B+ B+
(D15) C46-31 (BLU/WHT) Injection 1 & 2 Drive B+ B+
(1) Varies depending on engine load.
(2) All "0" volts are ground circuits (should read less than 0.50 volts).
Fig 2: Identifying ECM Pin Terminals (1.8L DOHC)
G93A79301Courtesy of ISUZU MOTOR CO.
ECM CONNECTOR A-B (24 PIN) TERMINAL PIN VOLTAGE (1.8L SOHC)

PIN & WIRE COLOR CIRCUIT NAME VOLTAGE KEY ON VOLTAGE ENGINE RUN
(A1) C47-1 (PNK/WHT) Fuel Pump Relay B+ (1) B+
(A2) C47-2 (GRY/RED) A/C Cut Out 0 0 OFF B+ ON
(A3) C47-3 (WHT/RED) Canister Purge VSV B+ B+
(A5) C47-5 (VLT) Check Engine Malfunction Indicator Lamp (MIL) Light 0 B+
(A6) C47-6 (RED/GRN) Ignition Feed Main Relay B+ B+
(A8) C47-8 (ORG/BLK) Serial Data Output 4.7 (2) 4.7 (2)
(A9) C47-9 (ORG/YEL) Diagnostic Request B+ B+
(A10) C47-10 (WHT) VSS Signal Input Varies With Vehicle Speed 0
(A11) C47-11 (GRY) ECT, MAP Sensor Ground 0 0
(A12) C47-12 (BLK/BLU) Engine Ground 0 0
(B1) C47-13 (RED/WHT) SBF Box (30A) B+ B+
(B3) C47-15 (YEL/VLT) Distributor Reference Ground 0 0
(B5) C47-17 (YEL/RED) Distributor Reference Input Signal 0 1.1
(B8) C47-20 (GRN/ORG) A/C Request Input 0 0
(B12) C47-24 (GRY/BLW) EGR Gas Temperature Sensor Input 5.0 N/A
(1) Reads B+ for 2 seconds after ign. is turned on, then zero volts.
(2) Scan tool disconnected.
ECM CONNECTOR C-D (32 PIN) TERMINAL PIN VOLTAGE (1.8L SOHC)

PIN & WIRE COLOR CIRCUIT NAME VOLTAGE KEY ON VOLTAGE ENGINE RUN
(C3) C46-3 (BRN/YEL) IAC (Coil B Low) Not Used Not Used
(C4) C46-4 (BRN/RED) IAC (Coil B High) Not Used Not Used
(C5) C46-5 (BRN/BLK) IAC (Coil A High) Not Used Not Used
(C6) C46-6 (BRN/WHT) IAC (Coil A Low) Not Used Not Used
(C7) C46-7 (GRN/YEL) Power Steering Switch Input B+ B+
(C10) C46-10 (GRY/BLK) ECT Sensor Signal Input Varies With Temp. Varies With Temp.
(C11) C46-11 (GRY/RED) MAP Sensor Signal Input 4.7 1.9
(C12) C46-12 (BLU/BLK) MAT Sensor Signal Input Varies With Temp. Varies With Temp.
(C13) C46-13 (YEL/BLU) TP Sensor Signal Input 0.56 0.56
(C14) C46-14 (BLU/ORG) +5V Reference Voltage Output 5.0 5.0
(C15) C46-15 (BLU/YEL) Injection 3 & 4 Drive B+ B+
(C16) C46-16 (RED/WHT) SBF Box (30A) B+ B+
(D1) C46-17 (BLK/BLU) Engine Ground 0 0
(D2) C46-18 (BLK) TP, IAT Sensor Ground 0 0
(D3) C46-19 (PNK/GRN) Peak & Hold Jumper D9 0 0
(D4) C46-20 (YEL) IC Output 0 1.15
(D5) C46-21 (YEL/GRN) Ignition Module Bypass Circuit 0 4.6
(D6) C46-22 (BLK/BLU) O2 Sensor Engine Ground Circuit 0 0
(D7) C46-23 (LTBLU) O2 Sensor Input Signal 0.38 Varies
(D8) C46-24 (PNK/BLK) Peak & Hold Jumper D13 0 0
(D9) C46-25 (PNK/BLK) Peak & Hold Jumper D3 0 0
(D12) C46-28 (WHT/GRN) EGR Control 0 B+
(D15) C46-31 (BLU/WHT) Injection 1 & 2 Drive B+ B+
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