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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
DTC 09:ER20 - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT BATTERY 
  • Measure battery voltage.
  • Is voltage 8.5 V-16 V  ?
 Yes Go to next step.
No Battery is weak or the system is overcharging.
  • Inspect charge/discharge system.
2 INSPECT WIRING HARNESS BETWEEN BATTERY AND FUSE BLOCK 
  • Measure voltage at fuse block terminals I and AE.
  • Is voltage 8.5 V-16 V  ?
 Yes Go to next step.
No Repair wiring harness between battery and fuse block.
3 INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND BASE UNIT 
  • Measure voltage at base unit connector terminals 1B and 1R.
  • Is voltage 8.5 V-16 V  ?
 Yes Go to next step.
No Repair wiring harness between fuse block and base unit.
4 INSPECT BASE UNIT 
  • Clear DTC.
  • Turn ignition switch to ACC or ON position and hold for 30 seconds or more. 
  • Start on-board diagnostic test mode.
  • Is DTC 09:Er20 displayed?
 Yes Replace base unit.
No Troubleshooting completed.
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