2001 SUZUKI GRAND VITARA Overdrive light

6-1-26 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)
PNP SIGNAL (Transmis-
sion Range Switch) (for 4-
A/T)With ignition switch ON, selector lever in “P”
or “N” positionP/N Range
✱
With ignition switch ON, selector lever in “R”,
“D”, “2” or “L” positionD Range
FUEL TANK LEVEL Ignition switch ON 0 – 100 %✱
ELECTRIC LOAD Ignition ON, small light OFF OFF✱
Ignition switch ON, small light ON ON✱
VSS (Vehicle speed sen-
sor) (for 4-A/T)At stop.
0 km/h 0 MPH✱
GEAR POSITION (for 4-
A/T)Ignition switch ON, selector lever is shifted at
“R”, “D”, “2” or “L” range and vehicle stops.1st✱
THROT POS LEVEL
(Throttle position level for
4-A/T)“0” (about idle position), “1”,“2”,“3”,“4”,“5”,“6” or “7” (about full open)
appears according to throttle valve opening.✱
SHIFT SOL #1 (A)
CON (Shift solenoid #1
command signal)
MON (Shift solenoid #1
monitor) (for 4-A/T)Ignition switch ON
Selector lever is shifted at “P”, “R”, “N”, “D”,
“2” or “L” range.
Vehicle stops.ON✱
SHIFT SOL #2 (B)
CON (Shift solenoid #2
command signal)
MON (Shift solenoid #2
monitor) (for 4-A/T)Ignition switch ON
Selector lever is shifted at “P”, “R”, “N”, “D”,
“2” or “L” range.
Vehicle stops.OFF✱
TCC SOL (for 4-A/T)
CON (Torque converter
clutch solenoid command
signal)
MON (Torque converter
clutch solenoid monitor)Ignition switch ON
Selector lever is shifted at “P”, “R”, “N”, “D”,
“2” or “L” range.
Vehicle stops.OFF✱
TRANS RANGE
(for 4-A/T)Ignition switch ON, selector lever is at “P”,
“R”, “N”, “D”, “2” or “L” range.P, R, N, D, 2 or L✱
BRAKE SW
(Brake, stop lamp, switch)
(for 4-A/T)Ignition switch ON, Brake pedal is released. OFF
✱
Ignition switch ON, Brake pedal is
depressed.ON
O/D OFF SW
(Overdrive cut switch)Ignition switch ON, Overdrive cut switch OFF OFF
✱
Ignition switch ON, Overdrive cut switch ON ON
MODE SELECT SW
(Power/Normal change
switch) (for 4-A/T)Ignition switch ON, P/N change switch is at
normal position.NORMAL
✱
Ignition switch ON, P/N change switch is at
power position.POWER
4WD-L SW
(4WD low switch)Ignition switch ON, Transfer lever is shifted
at “4H” or “2H” position.OFF
✱
Ignition switch ON, Transfer lever is shifted
at “4L” position.ON SCAN TOOL DATA CONDITIONNORMAL CONDITION/
REFERENCE VALUEOTHER

6-1-38 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)
E61-22A/C condenser fan motor relay
(if equipped)10 – 14 VIgnition switch ON, A/C not oper-
ated and Engine coolant temp. :
less than 113°C, 235°F
E61-23 Fuel pump relay0 – 2.5 VFor 3 sec. after ignition switch ON
or while engine running
10 – 14 VAfter 3 sec. from ignition switch ON
with engine stopped
E61-24Ground for CO adjusting resistor
(if equipped)––
E61-25 – – –
E61-26 – – –
E61-27 – – –
E61-28 Fuel level sensor 0 – 6 VIgnition switch ON
Voltage depends on fuel level
E61-29Diag. switch terminal
(vehicle with monitor connector)10 – 14 V Ignition switch ON
E61-30 ABS control module 10 – 14 V Ignition switch ON
E61-31Power/Normal change switch
(A/T vehicle)0 – 1 VIgnition switch ON, P/N change
switch : POWER mode
10 – 14 VIgnition switch ON, P/N change
switch : NORMAL mode
E61-32 Lighting switch0 – 1 VIgnition switch ON, lighting switch
OFF
10 – 14 VIgnition switch ON, lighting switch
ON
E61-33 Overdrive cut switch (A/T vehicle)10 – 14 VIgnition switch ON, overdrive cut
switch released
0 – 1 VIgnition switch ON, overdrive cut
switch pressed
E61-34 Stop lamp switch0 – 1 VBrake pedal released (switch OFF),
Ignition switch ON
10 – 14 VBrake pedal depressed (switch ON),
Ignition switch ON
E61-35 Cruise control module (if equipped) 10 – 14 V Ignition switch ON
C51-3-1 Intake air temp. sensor 2.2 – 3.0 VIgnition switch ON, Sensor ambient
temp. : 20°C, 68°F
C51-3-2 Engine coolant temp. sensor 0.5 – 0.9 VIgnition switch ON, Engine coolant
temp. : 80°C, 176°F
C51-3-3 Knock sensor About 2.5 VWith engine running at idle after
warned up
C51-3-4 Power source 10 – 14 V Ignition switch ON
C51-3-5 Ground for MAF sensor – –
C51-3-6 Ground – –
C51-3-7 4WD switch0 – 1 VIgnition switch ON, Transfer lever :
4H or 4L range
10 – 14 VIgnition switch ON, Transfer lever :
2H range
C51-3-8 Manifold absolute pressure sensor 3.3 – 4.3 V Ignition switch ON and engine stops TERMINAL CIRCUIT NORMAL VOLTAGE CONDITION

8E-4 CRUISE CONTROL SYSTEM
Components and functions
Component Function
Cruise control actuator
assembly with control mod-
uleCruise control module:
Executes centralized control by means of a microcomputer over all functions
including setting a constant speed, resuming it, setting coast, limiting minimum
speed and cancelling cruise control.
Cruise control actuator (stepping motor & clutch) :
Actuates accelerator pedal through cruise cable and arm according to a signal
from cruise control module to control vehicle speed.
Cruise main switch This switch has a momentary contact type button to turn the cruise control
system ON and OFF.
SET COAST switch When this switch is rotated (ON) and then released (OFF) while vehicle is run-
ning at a speed 40 km/h (25 mile/h) or higher, vehicle speed at that OFF
moment is stored in memory and it is maintained (constant cruising).
Rotating this switch (ON) continuously during constant cruising keeps slowing
down vehicle speed as long as it is ON. When it is released (OFF), vehicle
speed at that moment is stored in memory and vehicle starts constant cruising.
ACCEL RESUME switch When this switch is rotated (ON) during constant cruising, vehicle speed keeps
increasing as long as it is ON. When it is released (OFF), vehicle speed at that
moment is stored in memory and vehicle starts constant cruising. If vehicle
speed is higher than 40 km/h (25 mile/h) after cruise control is cancelled, turn-
ing this switch ON momentarily will resume the speed at which vehicle was run-
ning before cancellation.
CANCEL switch When this switch is pressed (ON), cruise control (accelerator pedal control) is
cancelled.
Vehicle speed sensor (VSS) The vehicle speed sensor (VSS) is mounted on the transfer or transmission.
The VSS converts vehicle speed into pulse signal and send it to the cruise con-
trol module.
Stop lamp switch The stop lamp switch has 2 contact points. One contact point closes when the
brake pedal is depressed to light the stop lamp and provides a voltage signal to
the cruise control module. This signal, when inputted cancels cruise control
(sets the accelerator pedal free).
The other contact point (brake pedal position switch) opens when the brake
pedal is depressed, to shut off the power to the magnetic clutch in the actuator,
thereby cancelling cruise control (setting the accelerator pedal free).
This switch is installed to cancel cruise control (constant cruising) without fail.
Clutch pedal position switch
(M/T vehicle only)When the clutch pedal is depressed, the clutch pedal position switch closes and
provides a ground signal to cruise control module.
The cruise control module cancels cruise control (accelerator pedal control)
when this signal is inputted.
Transmission range switch
(Park/Neutral position switch)
(A/T vehicle only)When the selector lever is places in either “P” or “N” position, the transmission
range switch closes and provides a ground signal to cruise control module. The
cruise control module cancels cruise control (accelerator pedal control) when
this signal is inputted.
PCM – Throttle opening sig-
nal (4 A/T vehicle only)Throttle opening signal is inputted from PCM.
From this signal, the cruise control module detects the throttle opening and
uses it as one of the factors to output the overdrive and TCC OFF command sig-
nal to PCM.

CRUISE CONTROL SYSTEM 8E-5
Cancel Conditions
Constant cruising is cancelled under the following conditions.
•Ignition switch is turned OFF.
•Cruise main switch is turned OFF.
•Vehicle speed has slowed down to lower than minimum operating speed (40 km/h (25 mile/h)).
•*Vehicle speed varies beyond cancel speed range (–15 km/h, –9 mile/h) from preset speed.
•*Brake pedal is depressed. (Stop lamp switch is turned ON).
•*Clutch pedal is depressed (Clutch pedal position switch is turned ON) (For M/T vehicle).
•*Selector lever is shifted to N range (Park/Neutral position switch in transmission range switch is turned ON).
•*CANCEL switch is turned ON.
Diagnosis
Diagnosis Table
PCM – Overdrive and TCC
off command signal outputWhen the throttle opening for the vehicle speed exceeds the specified value
during cruise control, the cruise control module sends this signal to PCM. PCM
uses this signal as one of signals to control 4-A/T.
Cruise main switch indicator
lampIn the state with the ignition switch ON and the cruise control system OFF,
pressing this switch once and releasing it will activate the cruise control system
and the cruise control module will cause the indicator lamp to light up.
“CRUISE” indicator lamp It lights up when cruise control (accelerator pedal control) is functioning. Component Function
NOTE:
When constant cruising is cancelled under above any condition with * (asterisk), vehicle speed before
cancellation can be resumed by operating ACCEL RESUME switch, provided that vehicle speed is
higher than 40 km/h (25 miles/h).
Condition Possible Cause Correction
Main switch indicator
lamp fails to light up
or remains ON.Main switch indicator lamp circuit faulty Refer to “CRUISE MAIN SWITCH INDI-
CATOR LAMP CIRCUIT CHECK” in this
section.
Cruise control module power and ground
circuits faultyRefer to “CRUISE CONTROL MODULE
POWER AND GROUND CIRCUIT
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly.
“CRUISE” indicator
lamp fails to light up
or remains ON.“CRUISE” indicator lamp circuit Refer to ““CRUISE” INDICATOR LAMP
CIRCUIT CHECK” in this section.
Cruise control module power and ground
circuitsRefer to “CRUISE CONTROL MODULE
POWER AND GROUND CIRCUIT
CHECK” in this section.
Actuator assembly faulty Replace actuator assembly.

CRUISE CONTROL SYSTEM 8E-17
Cruise Control Module and Its Circuit Inspection
VOLTAGE CHECK
Check for input or output voltage of control module (voltage between each circuit and body ground) with cruise
control module connector connected.CAUTION:
Cruise control module can not be checked by itself. It is strictly prohibited to connect voltmeter or
ohmmeter to cruise control module with coupler disconnected from it.
CIRCUIT NORMAL
VOLTAGECONDITION
Vehicle speed sensor Indicator deflection
repeated between
0 – 1 V and 3 – 5 VIgnition switch ON and cruise main switch ON. Vehicle
hoisted and rear left tire turned slowly with rear right
tire locked.
Stop lamp switch 0 – 2 V Brake pedal released.
10 – 14 V Brake pedal depressed.
Overdrive and TCC off signal
(4 A/T only) 10 – 14 V Ignition switch ON.
CRUISE indicator light 10 – 14 V Ignition switch ON.
Ground––
Brake pedal position switch
(in stop lamp switch) 10 – 14 V Ignition switch ON and brake pedal released.
0 V Ignition switch ON and brake pedal depressed.
Throttle valve opening signal
from PCM (4A/T only)Ignition switch ON.
Voltage varies as specified by graph in “THROTTLE VALVE OPENING SIG-
NAL CIRCUIT CHECK” in this section.
Cruise main switch 7 – 9V Ignition switch ON and cruise main switch released.
3 – 5 V Ignition switch ON and cruise main switch pressed.
CANCEL switch 0 – 1 V Ignition switch ON and CANCEL switch pressed.
COAST SET switch 1 – 2 V Ignition switch ON and COAST SET switch rotated.
RESUME ACCEL switch 2.5 – 4 V Ignition switch ON and RESUME ACCEL switch
rotated.
Clutch pedal position switch
(M/T only)10 – 14 V Ignition switch ON and clutch pedal released.
0 – 1 V Ignition switch ON and clutch pedal depressed fully.
Transmission range switch
(Park/Neutral position switch)
(A/T only)0 V Ignition switch ON and selector lever in “P” or “N”
range.
10 – 14 V Ignition switch ON and selector lever in “R”, “D”, “2” or
“L” range.
Cruise main switch indicator
lamp0 – 1 V Ignition switch ON.
10 – 14 V Ignition switch ON and after input main switch ON sig-
nal.