I16273

Combination Meter (Wire harness side)

Connector ”A” Connector ”B” Connector ”C”

1619 171820 151421 13211 5

1210 39 4 18 7

226

161718 1514132

115

12 1039 4 18 7 6 5

10 94

8 7 6123

AC2O9–01

AC–78–AIR CONDITIONING AIR CONDITIONING CONTROL SYSTEM

1366Author: Date:

2000 MR2 (RM760U)

AIR CONDITIONING CONTROLSYSTEMON–VEHICLE INSPECTION1. DISCONNECT COMBINATION MATER2. DISCONNECT ECM (See page SF–62)3. INSPECT A/C CONDITIONING CONTROL SYSTEM

CIRCUIT(a) Disconnect the connector from the combination meter

and inspect the connector on the wire harness side, asshown in the diagram below.Test condition:

Turn ignition switch to ON

Tester connection Condition Specified condition

B8 – Ground Constant Continuity

C1 – C4 Evaporator temperature at 25°C (77°F) 1.5 kΩ

If the circuit is not as specified, inspect the circuits connectedto other parts.

I16274

Combination Meter (From back side):

Connector ”A” Connector ”B” Connector ”C”

1619 171820 151421 13211 5

1210 39 4 18 7

226

161718 1514132

115

12 1039 4 18 7 6 5

10 94

8 7 6123

–AIR CONDITIONING AIR CONDITIONING CONTROL SYSTEMAC–79

1367Author: Date:

2000 MR2 (RM760U)

(b) Reonnect the connector to combination meter and in-spect the wire harness side from the back side, as shownin the diagram below.Test condition:

Run engine at idle speed Set on manifold gauge set

Tester connection Condition Specified condition

B13 G dA/C switch ON & Blower motor: operative Below 1.0 V

B13 – GroundA/C switch OFF Battery positive voltage

C10 G dMode selector: DEF. Below 1.0 V

C10 – GroundMode Selector: Except DEF. Battery positive voltage

C9 G dA/C switch ON Below 1.0 V

C9 – GroundA/C switch OFF Battery positive voltage

A1 G dBlower motor: Operative Below 2.0 V

A1 – GroundBlower motor: No operative Battery positive voltage

If the circuit is not as specified, inspect the circuits connectedto other parts.

I16645

E5

313029 2827171819202122 232425261113141516

12345678910

123456789101112131415

161718192021222324

1234567910111213141516

812 1819

202122

ECM (From back side):

141234568 79

1012131516171819202122

11232425262728

17

E4 E3 E2

AC–80–AIR CONDITIONING AIR CONDITIONING CONTROL SYSTEM

1368Author: Date:

2000 MR2 (RM760U)

(c) Inspect the wire harness side connector of the ECM fromthe back side, as shown in the diagram below.

Tester connection Condition Specified condition

E2 12 G dStart engine. Magnetic clutch: ON Below 1.0 V

E2–12 – GroundStart engine. Magnetic clutch: OFF Battery positive voltage

E3 28 G dStart engine. A/C switch ON Battery positive voltage

E3–28 – GroundStart engine. A/C switch OFF No voltage

Refrigerant pressure: 196 – 1,340 kPa Battery positive voltage

E3–18 – Ground Refrigerant pressure:

less than 196 or more than 1,340 kPaNo voltage

If the circuit is not as specified, inspect the circuits connectedto other parts.4. RECONNECT ECM (See page SF–62)5. RECONNECT COMBINATION METER