2000 SUZUKI SWIFT ECM

Applying Vacuum Displayed Value on Scan Tool
0Barometric pressure
(Approx. 100 kPa, 760 mmHg)
27 kPa
200 mmHgBarometric pressure –27 kPa
(Approx. 73 kPa, 560 mmHg
67 kPa
500 mmHgBarometric pressure –67 kPa
(Approx. 33 kPa, 260 mmHg)
ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-95
Fig. 2 for Step 2
STEPACTIONYESNO
2Check MAP Sensor
1) Remove MAP sensor from intake manifold and connect
vacuum pump gauge to MAP sensor. See Fig. 2.
2) Connect scan tool to DLC and turn ignition switch ON.
3) Check intake manifold absolute pressure displayed on
scan tool under following conditions.
Is check result satisfactory?Check air intake
system for air
being drawn in
and engine
compression.
If OK, then
substitute a
known-good ECM
(PCM) and
recheck.Replace MAP
sensor.

6-1-96 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
Main
fuse
M/T vehicle
A/T vehicle
Ignition
switch
(starter
switch)
Starter
Starter Transmission
range sensor (switch) Main
fuse
Ignition
switch
(starter
switch)
DTC P1500 ENGINE STARTER SIGNAL CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
DTC DETECTING CONDITIONPOSSIBLE CAUSE

Low voltage at terminal C03-17 when cranking
engine or

High voltage at terminal C03-17 after starting engine.
2 driving cycle detection logic, continuous monitoring.
“B/Y” circuit open

ECM (PCM) malfunction
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON, crank engine and run it at idle for 3 min.
3) Check pending DTC in “ON BOARD TEST” or “PENDING DTC” mode and DTC in “DTC” mode.
INSPECTION
STEPACTIONYESNO
1Was “ENGINE DIAG. FLOW TABLE” performed?Go to Step 2.Go to “ENGINE DIAG.
FLOW TABLE”.
2Check for voltage at terminal C03-17 of ECM
(PCM) connector connected, under following
condition.
While engine cranking : 6 – 10 V
After starting engine : 0 V
Is voltage as specified?Poor C03-17
connection or
intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection”
in Section 0A.
If wire and connections
are OK, substitute a
known-good ECM
(PCM) and recheck.“B/Y” circuit open.

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-97
Fuse box Main
fuse
DOME
RADIO
“LAMP”
DTC P1510 ECM (PCM) BACK-UP POWER SUPPLY MALFUNCTION
CIRCUIT DESCRIPTION
Battery voltage is supplied so that diagnostic trouble code memory, values for engine control learned by ECM
(PCM), etc. are kept in ECM (PCM) even when the ignition switch is turned OFF.
DTC DETECTING CONDITION
POSSIBLE CAUSE

Low voltage at terminal C02-7 after starting engine.
“W” circuit open

ECM (PCM) malfunction
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and run it at idle for 1 min.
2) Select “DTC” mode on scan tool and check DTC.
INSPECTION
STEPACTIONYESNO
1Check for voltage at terminal C02-7 of ECM
(PCM)connector connected, under each
condition, ignition switch OFF and engine
running.
Is it 10 – 14 V at each condition?Poor C02-7 connection
or intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection”
in Section 0A.
If wire and connections
are OK, substitute a
known- good ECM
(PCM) and recheck.“W” circuit open.

6-1-98 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
Ignition
switch
Main
fuseMain relay
Relay boxNo.1 injector
No.2 injector
No.3 injector
No.4 injector Fuse box
TABLE B-1 FUEL INJECTOR CIRCUIT CHECK
INSPECTION
STEPACTIONYESNO
1Was “ENGINE DIAG. FLOW TABLE” performed?Go to Step 2.Go to “ENGINE DIAG.
FLOW TABLE”.
2Check Injector for Operating Sound.
Using sound scope, check each injector for operating
sound at engine cranking.
Do all 4 injector make operating sound?Fuel injector circuit is
in good condition.Go to Step 3.
3Dose none of 4 injectors make operating sound at
Step 2?Go to Step 4.Check coupler
connection and wire
harness of injector
not making operatingnot making o erating
sound and injector
itself (Refer to Section
6E2).
4Check power circuit of injectors for open and short.
Is it normal?Check all 4 injectors
for resistance
respectively.
If resistance is OK,
substitute a known-
good ECM (PCM) and
recheck.Power circuit open or
short.

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-99
Main
fuseIgnition
switch
Main relay
Fuel pump relay Main relay
Fuel pump
CAUTION: Check to make sure that connection is
made between correct terminals. Wrong connection
can cause damage to ECM (PCM), wire harness, etc.
TABLE B-2 FUEL PUMP AND ITS CIRCUIT CHECK
INSPECTION
STEPACTIONYESNO
1Was “ENGINE DIAG. FLOW TABLE” performed?Go to Step 2.Go to “ENGINE
DIAG. FLOW
TABLE”.
2Check Fuel Pump Control System for Operation. See Fig. 1.
Is fuel pump heard to operate for 2 sec. after ignition switch
ON?Fuel pump circuit
is in good
condition.Go to Step 3.
3Check Fuel Pump for Operation.
1) Remove fuel pump relay from relay box with ignition
switch OFF.
2) Check for proper connection to relay at each terminals.
3) If OK, using service wire, connect terminals C44-3 and
C44-4 of relay connector. See Fig. 2.
Is fuel pump heard to operate at ignition switch ON?Go to Step 4.“P”, “B” or “R/B”
circuit open or fuel
pump malfunction.
4Check Fuel Pump Relay for Operation.
1) Check resistance between each two terminals of fuel
pump relay. See Fig.3.
Between terminals “c” and “d”: Infinity
Between terminals “a” and “b”: 100 – 150 Ω
2) Check that there is continuity between terminals “c” and
“d” when battery is connected to terminals “a” and “b”. See
Fig. 3.
Is fuel pump relay in good condition?“Y/Bl” circuit open
or poor C02-19
connection.
If wire and
connection are
OK, substitute a
known-good ECM
(PCM) and
recheck.Replace fuel pump
relay.

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-103
A/C
amplifier(A / C ON output signal)
(A / C input signal)
TABLE B-4 A / C SIGNAL CIRCUITS CHECK (VEHICLE WITH A / C)
INSPECTION
STEPACTIONYESNO
1Check A / C (input) Signal Circuit.
1) Check voltage at terminal C02-16. See Fig. 1.
While engine running and A / C
switch and / or heater blower switch
OFF (A / C is not operating) : 10 – 14 V
While engine running and both
A / C switch and heater blower
switch ON (A / C is operating) : About 0 V
Are check result as specified?Go to Step 2.“Lg / B” circuit open
or short,
Evaporative
temperature is
1C (34F) below
or faulty A / C
system.
2Check A / C ON (Output) Signal Circuit.
1) Check voltage at terminal C02-1. See Fig. 2.
While engine running and A / C
switch and / or heater blower
switch OFF (A / C is not operating) : About 0 V
While engine running at idle speed
and both A / C switch and heater blower
switch ON (A / C is operating) : 10 – 14 V
Are check result as specified?A / C control signal
circuits are in good
condition.“G/R” circuit open
or short, Poor
performance of
ECT sensor, TP
sensor, Engine
start signal
inputted or A / C
amplifier
malfunction.
If none of the
above exists,
substitute a
known-good ECM
and recheck.

6-1-104 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
Power steering
pressure
switch
Power steering
pump
Fig. 1 for Step 1 Fig. 2 for Step 2
TABLE B-5 POWER STEERING PRESSURE (PSP) SWITCH SIGNAL CIRCUIT
CHECK (If equipped)
INSPECTION
STEPACTIONYESNO
1Check PSP Switch Signal Circuit.
When using SUZUKI scan tool:
1) Connect SUZUKI scan tool to DLC with ignition switch
OFF.
2) Start engine and select “DATA LIST” mode on scan tool.
3) Check power steering pressure switch. See Fig. 1.
Engine running and steering
wheel at straight-ahead position : OFF, 10 – 14 V
Engine running and steering
wheel turned to the right or
left as far as it stops : ON, 0 – 1 V
Is it in good condition?
When not using SUZUKI scan tool:
1) Turn ignition switch ON.
2) Check for voltage at terminal C01-5 of ECM
connector connected, under above each condition.
Is each voltage as specified?Signal circuit is in
good condition.Go to Step 2.
2Check Wire Harness.
1) Turn ignition switch OFF and disconnect PSP switch
connector.
2) Check for proper connection to PSP switch.
3) If OK, then check voltage at PSP switch wire terminal
with ignition switch ON. See Fig. 2.
Is it 10 – 14V?Power steering
switch malfunction
or power steering
system
malfunction.“G/W” wire open
or shorted to
ground or poor
C01-5 connection.
If wire and
connection are
OK, substitute a
known-good ECM
and recheck.

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-105
Heater blower
switchRear defogger
switch Tail light relay
(Lighting switch)
Diodes in junction/
fuse block
Fig. 1 for Step 1 Fig. 2 for Step 1
TABLE B-6 ELECTRIC LOAD SIGNAL CIRCUIT CHECK
INSPECTION
STEPACTIONYESNO
1Check Electric Load Signal Circuit.
When using SUZUKI scan tool:
1) Connect SUZUKI scan tool to DLC with ignition
switch OFF.
2) Start engine and select “DATA LIST” mode on
scan tool.
3) Check electric load signal under following each
condition. See Fig. 1.
Ignition switch ON, Small light,
heater blower fan and rear
defogger all turned OFF : OFF
0 V (C01-17)
Ignition switch ON, Small light,
heater blower fan or rear
defogger turned ON : ON
10 – 14 V (C01-17)
Is check result satisfactory?
When not using SUZUKI scan tool:
1) Turn ignition switch ON.
2) Check voltage at terminals C01-17 of ECM (PCM)
connector connected, under above each condition.
See Fig. 2.
Is each voltage as specified?Electric load signal
circuit is in good
condition.“Br / Y” circuit open
or short, Electric
load diodes
malfunction or
Each electric load
circuit malfunction.