Air Intake System — Throttle Control System (Troubleshooting Flowchart)
6-86flowchartDiagnostic branches differ for With CATA (4P connector) vs Without CATA (2P connector); D16A6/A8 have catalytic converter, D16A7/A9 do not.
Throttle Control System
Troubleshooting Flowchart
1
Inspection of Throttle Control System
2
Start the engine and allow to idle.
3
Disconnect #6 hose from the dashpot diaphragm and connect a vacuum gauge.
4
Is there vacuum?
NO
- Check the 3-way joint A.
- Check the 3-way joint A.
- Repair blockage at port or pinch in #6 hose.
YES
5
Disconnect #22 hose from the dashpot diaphragm and connect a vacuum gauge.
NOTE:
• Coolant temperature must be below -10°C (14°F).
• Fast idle speed must be below 1,800 min⁻¹ (rpm).
6
Is there vacuum?
NO
(To page 6-87)
YES
7
Disconnect the 2P (Without CATA) or 4P (With CATA) connector.
8
Measure voltage between BLK/YEL (+) terminal and BLU (−) terminal.
9
Is there battery voltage?
YES
Replace the dashpot control solenoid valve.
NO
10
Measure voltage between BLK/YEL (+) terminal and body ground.
11
Is there battery voltage?
NO
Repair open in BLK/YEL wire between No.14 fuse and the connector.
YES
12
(To page 6-87)