Suzuki Jimny Service Manual page 475

6-118 ENGINE GENERAL INFORMATION AND DIAGNOSIS
INSPECTION
Step
1 Check evaporator temp. sensor.
1) Disconnect ECM connectors with ignition
switch at OFF position.
2) Check resistance between E19-14 terminal
and E19-10 terminal.
Reference value
(Refer to characteristic curve below)
ECT sensor resistance
At 0°C 6.3 – 6.9 kΩ Ω Ω Ω
At 25°C 1.8 – 2.2 kΩ Ω Ω Ω
Is it within specification?
2 Check A/C switch circuit.
1) Check voltage at E18-16 terminal under
each condition given below.
A/C switch signal specification
Ignition switch ON A/C switch OFF
: 10 – 14 V
Ignition switch ON A/C switch ON
: 0 – 1 V
Is check result satisfactory?
3 Check A/C compressor signal.
1) Check voltage at E18-1 terminal under each
condition given below. See NOTE.
A/C compressor signal specification
While engine running, A/C switch OFF
: 0 V
While engine running, A/C switch ON
: 10 – 14 V
Is check result satisfactory?
NOTE:
When A/C evaporator thermistor temp. is below 2.5 °C (36.5 °F), A/C remain OFF (E18-1 terminal volt-
age become 0 – 1 V). This condition is not abnormal.
Fig. 1 for Step 1
Action Yes
Go to Step 2.
Go to Step 3.
A/C control system cir-
cuits are in good condi-
tion.
No
Faulty A/C evaporator
thermistor or its circuit.
"G/W" wire open or short
Poor E18-16 terminal con-
nection
If wire and connection are
OK, substitute a known-
good ECM and recheck.
Go to Step 3.
"P" wire open or short
Poor E18-1 terminal con-
nection
If wire and connection are
OK, substitute a known-
good ECM and recheck.