Scan Tool Testing and Procedures
SCAN TOOL DATAAs the data values given below are standard values estimated on the basis of values obtained from the normally operating vehicles by using a scan tool, use them as reference values. Even when the vehicle is in good condition, there may be cases where the checked value does not fall within each specified data range. Therefore, judgment as abnormal should not be made by checking with these data alone.
Also, conditions in the table that can be checked by the scan tool are those output from ECM (PCM) as Commands and there may be cases where the engine or actuator is not operating (in the condition) as indicated by the scan tool. Be sure to use the timing light to check the ignition timing.
NOTE:
- For asterisk (*) marked item in OTHER column, item can be read only SUZUKI scan tool.
- When checking the data with the engine running at idle or racing, be sure to shift M/T gear to the neutral gear position and A/T gear to the "Park" position and pull the parking brake fully. Also, if nothing or "no load" is indicated, turn OFF A/C, all electric loads, P/S and all the other necessary switches.
SCAN TOOL DATA DEFINITIONS COOLANT TEMP (ENGINE COOLANT TEMP., °C/°F)
It is detected by engine coolant temp. sensor.
INTAKE AIR TEMP (°C/°F)
It is detected by intake air temp. sensor.
DESIRE IDLE (DESIRED IDLE SPEED RPM)
The desired idle speed is an ECM (PCM) internal parameter which indicates the ECM (PCM) requested idle. If the engine is not running, the number is not valid.
CLOSED THROT POS (CLOSED THROTTLE POSITION ON/OFF)
This parameter will read ON when the throttle valve is fully closed. Or OFF when the throttle is not fully closed.
IAC FLOW DUTY (%)
This parameter indicates IAC valve opening rate which controls bypass air flow.
ENGINE SPEED (RPM)
It is computed by reference pulses from the Camshaft Position Sensor.
SHORT FT B1 (SHORT TERM FUEL TRIM BANK 1,%)
SHORT FT B2 (SHORT TERM FUEL TRIM BANK 2, %)
Short term fuel trim value represents short term corrections to the air/fuel mixture computation. A value of 0 indicates no correction, a value greater than 0 means an enrichment correction, and a value less than 0 implies an enleanment correction.
LONG FT B1 (LONG TERM FUEL TRIM BANK 1,%)
LONG FT B2 (LONG TERM FUEL TRIM BANK 2,%)
Long term fuel trim value represents long term corrections to the air/fuel mixture computation. A value of 0 indicates no correction, a value greater than 0 means an enrichment correction, and a value less than 0 implies an enleanment correction.
IGNITION ADVANCE (IGNITION TIMING ADVANCE FOR NO.1 CYLINDER, 0)
Ignition timing of No.1 cylinder is commanded by ECM (PCM). The actual ignition timing should be checked by using the timing light.
BATTERY VOLTAGE (V)
This parameter indicates battery positive voltage inputted from main relay to ECM (PCM).
MAF (MASS AIR FLOW RATE, g/s, lb/min)
It represents total mass of air entering intake manifold which is measured by mass air flow sensor.
INJ PULSE WIDTH B1 (FUEL INJECTION PULSE WIDTH BANK 1, msec)
INJ PULSE WIDTH B2 (FUEL INJECTION PULSE WIDTH BANK 2, msec)
This parameter indicates time of the injector drive (valve opening) pulse which is output from ECM (PCM).
THROTTLE POS (ABSOLUTE THROTTLE POSITION,%)
When throttle position sensor is fully closed position, throttle opening is indicated as 0% and 100% for full open position.
TP SENSOR VOLT (TP SENSOR OUTPUT VOLTAGE, V)
Throttle Position Sensor reading provides throttle valve opening information in the from of voltage.
OXYGEN SENSOR B1 51 (HO2S BANK 1 SENSOR 1 OUTPUT VOLTAGE, V)
OXYGEN SENSOR B2 51 (HO2S BANK 2 SENSOR 1 OUTPUT VOLTAGE, V)
It indicates output voltage of HO2S SENSOR 1 installed on exhaust manifold (pre-catalyst).
OXYGEN SENSOR B1 82 (HO2S BANK 1 SENSOR 2 OUTPUT VOLTAGE, V)
OXYGEN SENSOR B1 82 (HO2S BANK 2 SENSOR 2 OUTPUT VOLTAGE, V)
If indicates output voltage of HO2S SENSOR 2 installed on exhaust pipe (post-catalyst). It is used to detect catalyst deterioration.
FUEL SYSTEM B1 (FUEL SYSTEM BANK 1 STATUS)
FUEL SYSTEM B2 (FUEL SYSTEM BANK 2 STATUS)
Air/fuel ratio feedback loop status displayed as one of the followings.
OPEN: Open loop-has not yet satisfied conditions to go closed loop.
CLOSED: Closed loop-using oxygen sensor(s) as feedback for fuel control.
OPEN-DRIVE COND: Open loop due to driving conditions (Power enrichment, etc.).
OPEN SYS FAULT: Open loop due to detected system fault.
CLOSED-ONE O2S: Closed loop, but fault with at least one oxygen sensor-may be using single oxygen sensor for fuel control.
CALC LOAD (CALCULATED LOAD VALUE, %)
Engine load displayed as a percentage of maximum possible load. Value is calculated mathematically using the formula: actual (current) intake air volume + maximum possible intake air volume x 100%.
TOTAL FUEL TRIM (%)
The value of total fuel trim is obtained by putting values of short term fuel trim and long term fuel trim together. This value indicates how much correction is necessary to keep the air/fuel mixture stoichiometrical.
CANIST PRG DUTY (EVAP CANISTER PURGE FLOW DUTY, %)
This parameter indicates valve ON (valve open) time rate within a certain set cycle of EVAP canister purge valve which controls the amount of EVAP purge.
VEHICLE SPEED (kph, MPH)
It is computed based on pulse signals from vehicle speed sensor on transfer or transmission.
FUEL CUT (ON/OFF)
ON: Fuel being cut (output signal to injector is stopped).
OFF: Fuel not being cut.
CANIST AIR VAL (EVAP CANISTER AIR VALVE, ON/OFF)
ON: ON command being output to EVAP canister air valve.
OFF: ON command not being output.
FUEL TANK PRESS (FUEL TANK PRESSURE, mmHg, kPa)
This parameter indicates the pressure in the fuel tank expressed with respect to the barometric pressure. When it is equal to the barometric pressure, it is indicated as 0 mmHg.
TANK PRESS SOL (TANK PRESSURE CONTROL SOLENOID VALVE STATUS, ON/OFF)
ON: ON command being output to tank pressure control solenoid valve.
OFF: ON command not being output.
MAP (MANIFOLD ABSOLUTE PRESSURE, mmHg, kPa)
This parameter indicates the pressure in the intake manifold absolute pressure.
EGR VALVE (%)
This parameter indicates opening rate of EGR valve which controls the amount of EGR flow.
A/C SWITCH (ON/OFF)
ON: Command for operation being output from A/C amplifier to compressor.
OFF: Command for operation not being output.
PSP SWITCH (ON/OFF)
ON: PSP switch detects P/S operation. (high PS pressure)
OFF: PSP switch not detects P/S operation
PNP SIGNAL (TRANSMISSION RANGE SWITCH, P/N or D range)
Whether the transmission range switch (P/N position switch) at P or N range or at R, D, 2 or L range is displayed. If at P or N range, "P/N range" is displayed and if at R, D, 2 or L range, "D range" is displayed.
FUEL TANK LEVEL (%)
This parameter indicates approximate fuel level in the fuel tank. As the detectable range of the fuel level sensor is set as 0 to 100%, however, with some models whose fuel tank capacity is smaller, the indicated fuel level may be only 70% even when the fuel tank is full.
ELECTRIC LOAD (ON/OFF)
ON: Small light switch ON or rear window defogger switch ON.
OFF: Small light switch OFF and rear window defogger switch OFF.
VSS (4-A/T) (kph, MPH)
It is computed by using pulse signals from vehicle speed sensor on 4-speed automatic transmission.
GEAR POSITION (1ST, 2ND, 3RD or 4TH)
The gear position is determined on the basis of the command state signals generated from PCM to shift solenoids A and B (#1 and #2) and displayed as shown in the table.
THROT POS LEVEL (THROTTLE POSITION LEVEL FOR 4-A/T , "0" ,"1" ,"2" ,"3" ,"4" ,"5" ,"6" or "7")
This parameter indicates which level (zone) the throttle valve opening is in.
The throttle opening is divided into 8 levels (zones) from "0" (about idle position) to "7" (about full open) and signals are assigned to each opening level (zone). PCM controls the automatic gear change of the automatic transmission by using these signals according to the signal from the TP sensor.
SHIFT SOL #1 CON/MON (SHIFT SOLENOID #1, A COMMAND/MONITOR, ON/OFF)
CON-ON: ON command being output to shift solenoid #1, A.
CON-OFF: ON command not being output.
MON-ON: Electricity being passed to shift solenoid #1, A.
MON-OFF: Electricity not being passed.
SHIFT SOL #2 CON/MON (SHIFT SOLENOID #2, B COMMAND/MONITOR, ON/OFF)
CON-ON: ON command being output to shift solenoid #2, B.
CON-OFF: ON command not being output.
MON-ON: Electricity being passed to shift solenoid #2, B.
MON-OFF: Electricity not being passed.
TCC SOL CON/MON (TORQUE CONVERTER CLUTCH SOLENOID COMMAND/MONITOR, ON/OFF)
CON-ON: ON command being output to TCC solenoid.
CON-OFF: ON command not being output.
MON-ON: Electricity being passed to TCC solenoid.
MON-OFF: Electricity not being passed.
TRANS RANGE (TRANSMISSION RANGE, P, R, N, D, 2 or L)
It indicates transmission range according to transmission range switch signal.
BRAKE SW (BRAKE, STOP LAMP, SWITCH, ON/OFF)
OFF: Brake pedal is released.
ON: Brake pedal is depressed.
O/D OFF SW (OVERDRIVE CUT SWITCH, ON/OFF)
OFF: Overdrive cut switch OFF
ON: Overdrive cut switch ON
MODE SELECT SW (POWER/NORMAL CHANGE SWITCH, POWER/NORMAL)
POWER: Switch button is at POWER position.
NORMAL: Switch button is at NORMAL position.
4WD-L SW (4WD-LOW SWITCH, ON/OFF)
ON: Transfer lever is shifted to 4L position.
OFF: Transfer lever is shifted to 4H or 2H position.
O/D & TCC OFF SIG (OVER DRIVE AND TORQUE CONVERTER CLUTCH OFF SIGNAL, ON/OFF)
ON: Gear position is 4th and TCC ON.
OFF: Gear position is other than 4th or TCC OFF.